diff --git a/.github/workflows/example-6.yml b/.github/workflows/example-6.yml
new file mode 100644
index 00000000..7699240c
--- /dev/null
+++ b/.github/workflows/example-6.yml
@@ -0,0 +1,33 @@
+name: "Example 6: Mamba"
+
+on:
+  pull_request:
+    branches:
+    - '*'
+  push:
+    branches:
+    - 'master'
+
+jobs:
+  example-6:
+    name: Ex6 Mamba
+    runs-on: 'ubuntu-latest'
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+        with:
+          python-version: 3.6
+          mamba-version: "*"
+          channels: conda-forge,defaults
+          channel-priority: true
+          activate-environment: anaconda-client-env
+          environment-file: etc/example-environment.yml
+      - shell: bash -l {0}
+        run: |
+          conda info
+          conda list
+          conda config --show-sources
+          conda config --show
+          printenv | sort
+      - shell: bash -l {0}
+        run: mamba install jupyterlab
diff --git a/README.md b/README.md
index 0b288012..531e71ad 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@
 ![Example 3: Other options](https://github.com/goanpeca/setup-miniconda/workflows/Example%203:%20Other%20options/badge.svg?branch=master)
 ![Example 4: Channels](https://github.com/goanpeca/setup-miniconda/workflows/Example%204:%20Channels/badge.svg?branch=master)
 ![Example 5: Custom installer](https://github.com/goanpeca/setup-miniconda/workflows/Example%205:%20Custom%20installer/badge.svg?branch=master)
+![Example 6: Mamba](https://github.com/goanpeca/setup-miniconda/workflows/Example%206:%20Mamba/badge.svg?branch=master)
 ![Caching Example](https://github.com/goanpeca/setup-miniconda/workflows/Caching%20Example/badge.svg?branch=master)
 ![Linting](https://github.com/goanpeca/setup-miniconda/workflows/Linting/badge.svg?branch=master)
 
@@ -217,6 +218,36 @@ jobs:
           conda config --show
 ```
 
+#### Example 6: Mamba
+
+Experimental! Use `mamba` to handle conda installs in a faster way. `mamba-version` accepts a version string `x.y` (including `"*"`). It requires you specify `conda-forge` as part of the channels, ideally with the highest priority.
+
+```yaml
+jobs:
+  example-6:
+    name: Ex6 Mamba
+    runs-on: "ubuntu-latest"
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+        with:
+          python-version: 3.6
+          mamba-version: "*"
+          channels: conda-forge,defaults
+          channel-priority: true
+          activate-environment: anaconda-client-env
+          environment-file: etc/example-environment.yml
+      - shell: bash -l {0}
+        run: |
+          conda info
+          conda list
+          conda config --show-sources
+          conda config --show
+          printenv | sort
+      - shell: bash -l {0}
+        run: mamba install jupyterlab
+```
+
 ## Caching
 
 If you want to enable package caching for conda you can use the [cache action](https://github.com/actions/cache) using `~/conda_pkgs_dir` as path for conda packages.
diff --git a/action.yml b/action.yml
index ff4a26e2..28abc1c2 100644
--- a/action.yml
+++ b/action.yml
@@ -78,6 +78,10 @@ inputs:
     description: 'Advanced. Prior to runnning "conda init" all shell profiles will be removed from the runner. Default is "true".'
     required: false
     default: "true"
+  mamba-version:
+    description: 'Experimental. Use mamba (https://github.com/QuantStack/mamba) as a faster drop-in replacement for conda installs. Disabled by default. To enable, use "*" or a "x.y" version string.'
+    required: false
+    default: ""
 runs:
   using: "node12"
   main: "dist/setup/index.js"
diff --git a/dist/setup/index.js b/dist/setup/index.js
index c53b8c54..2b7e4cab 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -21368,12 +21368,16 @@ function minicondaPath(useBundled = true) {
     return condaPath;
 }
 /**
- * Provide cross platform location of conda executable
+ * Provide cross platform location of conda/mamba executable
  */
-function condaExecutable(useBundled) {
+function condaExecutable(useBundled, useMamba = false) {
     const dir = minicondaPath(useBundled);
     let condaExe;
-    condaExe = IS_UNIX ? `${dir}/condabin/conda` : `${dir}\\condabin\\conda.bat`;
+    let commandName;
+    commandName = useMamba ? "mamba" : "conda";
+    condaExe = IS_UNIX
+        ? `${dir}/condabin/${commandName}`
+        : `${dir}\\condabin\\${commandName}.bat`;
     return condaExe;
 }
 /**
@@ -21510,9 +21514,9 @@ function installMiniconda(installerPath, useBundled) {
 /**
  * Run Conda command
  */
-function condaCommand(cmd, useBundled) {
+function condaCommand(cmd, useBundled, useMamba = false) {
     return __awaiter(this, void 0, void 0, function* () {
-        const command = `${condaExecutable(useBundled)} ${cmd}`;
+        const command = `${condaExecutable(useBundled, useMamba)} ${cmd}`;
         return yield execute(command);
     });
 }
@@ -21541,7 +21545,7 @@ function setVariables(useBundled) {
 /**
  * Create test environment
  */
-function createTestEnvironment(activateEnvironment, useBundled) {
+function createTestEnvironment(activateEnvironment, useBundled, useMamba) {
     return __awaiter(this, void 0, void 0, function* () {
         let result;
         if (activateEnvironment !== "root" &&
@@ -21549,7 +21553,7 @@ function createTestEnvironment(activateEnvironment, useBundled) {
             activateEnvironment !== "") {
             if (!environmentExists(activateEnvironment, useBundled)) {
                 utils.consoleLog("Create test environment...");
-                result = yield condaCommand(`create --name ${activateEnvironment}`, useBundled);
+                result = yield condaCommand(`create --name ${activateEnvironment}`, useBundled, useMamba);
                 if (!result.ok)
                     return result;
             }
@@ -21633,7 +21637,7 @@ function condaInit(activateEnvironment, useBundled, condaConfig, removeProfiles)
         // Run conda init
         core.info("\n");
         for (let cmd of ["--all"]) {
-            const command = `${condaExecutable(useBundled)} init ${cmd}`;
+            const command = `${condaExecutable(useBundled, false)} init ${cmd}`;
             yield execute(command);
         }
         // Rename files
@@ -21730,9 +21734,9 @@ conda activate ${activateEnvironment}`;
 /**
  * Setup python test environment
  */
-function setupPython(activateEnvironment, pythonVersion, useBundled) {
+function setupPython(activateEnvironment, pythonVersion, useBundled, useMamba) {
     return __awaiter(this, void 0, void 0, function* () {
-        return yield condaCommand(`install --name ${activateEnvironment} python=${pythonVersion}`, useBundled);
+        return yield condaCommand(`install --name ${activateEnvironment} python=${pythonVersion}`, useBundled, useMamba);
     });
 }
 /**
@@ -21751,22 +21755,22 @@ function applyCondaConfiguration(condaConfig, useBundled) {
                         let channels = condaConfig[key].split(",").reverse();
                         let channel;
                         for (channel of channels) {
-                            result = yield condaCommand(`config --add ${key} ${channel}`, useBundled);
+                            result = yield condaCommand(`config --add ${key} ${channel}`, useBundled, false);
                             if (!result.ok)
                                 return result;
                         }
                     }
                     else {
-                        result = yield condaCommand(`config --set ${key} ${condaConfig[key]}`, useBundled);
+                        result = yield condaCommand(`config --set ${key} ${condaConfig[key]}`, useBundled, false);
                         if (!result.ok)
                             return result;
                     }
                 }
             }
-            result = yield condaCommand(`config --show-sources`, useBundled);
+            result = yield condaCommand(`config --show-sources`, useBundled, false);
             if (!result.ok)
                 return result;
-            result = yield condaCommand(`config --show`, useBundled);
+            result = yield condaCommand(`config --show`, useBundled, false);
             if (!result.ok)
                 return result;
         }
@@ -21779,10 +21783,11 @@ function applyCondaConfiguration(condaConfig, useBundled) {
 /**
  * Main conda setup method to handle all configuration options
  */
-function setupMiniconda(installerUrl, minicondaVersion, architecture, condaVersion, condaBuildVersion, pythonVersion, activateEnvironment, environmentFile, condaConfigFile, condaConfig, removeProfiles) {
+function setupMiniconda(installerUrl, minicondaVersion, architecture, condaVersion, condaBuildVersion, pythonVersion, activateEnvironment, environmentFile, condaConfigFile, condaConfig, removeProfiles, mambaVersion) {
     return __awaiter(this, void 0, void 0, function* () {
         let result;
         let useBundled = true;
+        let useMamba = false;
         try {
             // Check for consistency
             if (condaConfig["auto_update_conda"] == "true" && condaVersion) {
@@ -21794,6 +21799,12 @@ function setupMiniconda(installerUrl, minicondaVersion, architecture, condaVersi
                     error: new Error(`"python-version=${pythonVersion}" was provided but "activate-environment" is not defined!`)
                 };
             }
+            if (!condaConfig["channels"].includes("conda-forge") && mambaVersion) {
+                return {
+                    ok: false,
+                    error: new Error(`"mamba-version=${mambaVersion}" requires "conda-forge" to be included in "channels!"`)
+                };
+            }
             if (installerUrl !== "") {
                 if (minicondaVersion !== "") {
                     return {
@@ -21856,7 +21867,7 @@ function setupMiniconda(installerUrl, minicondaVersion, architecture, condaVersi
             }
             let cacheFolder = "~/conda_pkgs_dir";
             cacheFolder = cacheFolder.replace("~", os.homedir().replace("\\", "/"));
-            result = yield condaCommand(`config --add pkgs_dirs ${cacheFolder}`, useBundled);
+            result = yield condaCommand(`config --add pkgs_dirs ${cacheFolder}`, useBundled, useMamba);
             if (!result.ok)
                 return result;
             core.exportVariable("CONDA_PKGS_DIR", cacheFolder);
@@ -21877,7 +21888,7 @@ function setupMiniconda(installerUrl, minicondaVersion, architecture, condaVersi
                 // if (!result.ok) return result;
             }
             utils.consoleLog("Setup Conda basic configuration...");
-            result = yield condaCommand("config --set always_yes yes --set changeps1 no", useBundled);
+            result = yield condaCommand("config --set always_yes yes --set changeps1 no", useBundled, useMamba);
             if (!result.ok)
                 return result;
             utils.consoleLog("Initialize Conda and fix ownership...");
@@ -21886,13 +21897,13 @@ function setupMiniconda(installerUrl, minicondaVersion, architecture, condaVersi
                 return result;
             if (condaVersion) {
                 utils.consoleLog("Installing Conda...");
-                result = yield condaCommand(`install --name base conda=${condaVersion}`, useBundled);
+                result = yield condaCommand(`install --name base conda=${condaVersion}`, useBundled, useMamba);
                 if (!result.ok)
                     return result;
             }
             if (condaConfig["auto_update_conda"] == "true") {
                 utils.consoleLog("Updating conda...");
-                result = yield condaCommand("update conda", useBundled);
+                result = yield condaCommand("update conda", useBundled, useMamba);
                 if (!result.ok)
                     return result;
                 if (condaConfig) {
@@ -21903,20 +21914,33 @@ function setupMiniconda(installerUrl, minicondaVersion, architecture, condaVersi
                 }
             }
             // Any conda commands run here after init and setup
+            if (mambaVersion) {
+                utils.consoleLog("Installing Mamba...");
+                core.warning(`Mamba support is still experimental and can result in differently solved environments!`);
+                if (mambaVersion) {
+                    result = yield condaCommand(`install --name base mamba=${mambaVersion}`, useBundled, useMamba);
+                }
+                if (result.ok) {
+                    useMamba = true;
+                }
+                else {
+                    return result;
+                }
+            }
             if (condaBuildVersion) {
                 utils.consoleLog("Installing Conda Build...");
-                result = yield condaCommand(`install --name base conda-build=${condaBuildVersion}`, useBundled);
+                result = yield condaCommand(`install --name base conda-build=${condaBuildVersion}`, useBundled, useMamba);
                 if (!result.ok)
                     return result;
             }
             if (activateEnvironment) {
-                result = yield createTestEnvironment(activateEnvironment, useBundled);
+                result = yield createTestEnvironment(activateEnvironment, useBundled, useMamba);
                 if (!result.ok)
                     return result;
             }
             if (pythonVersion && activateEnvironment) {
                 utils.consoleLog(`Installing Python="${pythonVersion}" on "${activateEnvironment}" environment...`);
-                result = yield setupPython(activateEnvironment, pythonVersion, useBundled);
+                result = yield setupPython(activateEnvironment, pythonVersion, useBundled, useMamba);
                 if (!result.ok)
                     return result;
             }
@@ -21945,7 +21969,7 @@ function setupMiniconda(installerUrl, minicondaVersion, architecture, condaVersi
                 else {
                     condaAction = "create";
                 }
-                result = yield condaCommand(`env ${condaAction} -f ${environmentFile}`, useBundled);
+                result = yield condaCommand(`env ${condaAction} -f ${environmentFile}`, useBundled, useMamba);
                 if (!result.ok)
                     return result;
             }
@@ -21983,6 +22007,8 @@ function run() {
             let removeProfiles = core.getInput("remove-profiles");
             let showChannelUrls = core.getInput("show-channel-urls");
             let useOnlyTarBz2 = core.getInput("use-only-tar-bz2");
+            // Mamba
+            let mambaVersion = core.getInput("mamba-version");
             const condaConfig = {
                 add_anaconda_token: addAnacondaToken,
                 add_pip_as_python_dependency: addPipAsPythonDependency,
@@ -21995,7 +22021,7 @@ function run() {
                 show_channel_urls: showChannelUrls,
                 use_only_tar_bz2: useOnlyTarBz2
             };
-            const result = yield setupMiniconda(installerUrl, minicondaVersion, "x64", condaVersion, condaBuildVersion, pythonVersion, activateEnvironment, environmentFile, condaFile, condaConfig, removeProfiles);
+            const result = yield setupMiniconda(installerUrl, minicondaVersion, "x64", condaVersion, condaBuildVersion, pythonVersion, activateEnvironment, environmentFile, condaFile, condaConfig, removeProfiles, mambaVersion);
             if (!result.ok) {
                 throw result.error;
             }
@@ -29040,7 +29066,7 @@ module.exports = defaults;
 /* 771 */
 /***/ (function(module) {
 
-module.exports = {"_args":[["cheerio@1.0.0-rc.3","/Users/goanpeca/Dropbox (Personal)/develop/quansight/setup-miniconda"]],"_from":"cheerio@1.0.0-rc.3","_id":"cheerio@1.0.0-rc.3","_inBundle":false,"_integrity":"sha512-0td5ijfUPuubwLUu0OBoe98gZj8C/AA+RW3v67GPlGOrvxWjZmBXiBCRU+I8VEiNyJzjth40POfHiz2RB3gImA==","_location":"/cheerio","_phantomChildren":{},"_requested":{"type":"version","registry":true,"raw":"cheerio@1.0.0-rc.3","name":"cheerio","escapedName":"cheerio","rawSpec":"1.0.0-rc.3","saveSpec":null,"fetchSpec":"1.0.0-rc.3"},"_requiredBy":["/get-hrefs"],"_resolved":"https://registry.npmjs.org/cheerio/-/cheerio-1.0.0-rc.3.tgz","_spec":"1.0.0-rc.3","_where":"/Users/goanpeca/Dropbox (Personal)/develop/quansight/setup-miniconda","author":{"name":"Matt Mueller","email":"mattmuelle@gmail.com","url":"mat.io"},"bugs":{"url":"https://github.com/cheeriojs/cheerio/issues"},"dependencies":{"css-select":"~1.2.0","dom-serializer":"~0.1.1","entities":"~1.1.1","htmlparser2":"^3.9.1","lodash":"^4.15.0","parse5":"^3.0.1"},"description":"Tiny, fast, and elegant implementation of core jQuery designed specifically for the server","devDependencies":{"benchmark":"^2.1.0","coveralls":"^2.11.9","expect.js":"~0.3.1","istanbul":"^0.4.3","jquery":"^3.0.0","jsdom":"^9.2.1","jshint":"^2.9.2","mocha":"^3.1.2","xyz":"~1.1.0"},"engines":{"node":">= 0.6"},"files":["index.js","lib"],"homepage":"https://github.com/cheeriojs/cheerio#readme","keywords":["htmlparser","jquery","selector","scraper","parser","html"],"license":"MIT","main":"./index.js","name":"cheerio","repository":{"type":"git","url":"git://github.com/cheeriojs/cheerio.git"},"scripts":{"test":"make test"},"version":"1.0.0-rc.3"};
+module.exports = {"_args":[["cheerio@1.0.0-rc.3","/home/jaime/devel/py/jaimergp/setup-miniconda"]],"_from":"cheerio@1.0.0-rc.3","_id":"cheerio@1.0.0-rc.3","_inBundle":false,"_integrity":"sha512-0td5ijfUPuubwLUu0OBoe98gZj8C/AA+RW3v67GPlGOrvxWjZmBXiBCRU+I8VEiNyJzjth40POfHiz2RB3gImA==","_location":"/cheerio","_phantomChildren":{},"_requested":{"type":"version","registry":true,"raw":"cheerio@1.0.0-rc.3","name":"cheerio","escapedName":"cheerio","rawSpec":"1.0.0-rc.3","saveSpec":null,"fetchSpec":"1.0.0-rc.3"},"_requiredBy":["/get-hrefs"],"_resolved":"https://registry.npmjs.org/cheerio/-/cheerio-1.0.0-rc.3.tgz","_spec":"1.0.0-rc.3","_where":"/home/jaime/devel/py/jaimergp/setup-miniconda","author":{"name":"Matt Mueller","email":"mattmuelle@gmail.com","url":"mat.io"},"bugs":{"url":"https://github.com/cheeriojs/cheerio/issues"},"dependencies":{"css-select":"~1.2.0","dom-serializer":"~0.1.1","entities":"~1.1.1","htmlparser2":"^3.9.1","lodash":"^4.15.0","parse5":"^3.0.1"},"description":"Tiny, fast, and elegant implementation of core jQuery designed specifically for the server","devDependencies":{"benchmark":"^2.1.0","coveralls":"^2.11.9","expect.js":"~0.3.1","istanbul":"^0.4.3","jquery":"^3.0.0","jsdom":"^9.2.1","jshint":"^2.9.2","mocha":"^3.1.2","xyz":"~1.1.0"},"engines":{"node":">= 0.6"},"files":["index.js","lib"],"homepage":"https://github.com/cheeriojs/cheerio#readme","keywords":["htmlparser","jquery","selector","scraper","parser","html"],"license":"MIT","main":"./index.js","name":"cheerio","repository":{"type":"git","url":"git://github.com/cheeriojs/cheerio.git"},"scripts":{"test":"make test"},"version":"1.0.0-rc.3"};
 
 /***/ }),
 /* 772 */
diff --git a/package-lock.json b/package-lock.json
index ab7a006d..bde8767e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "action-setup-conda",
-  "version": "1.4.1",
+  "version": "1.5.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/src/setup.ts b/src/setup.ts
index ebf9e3e5..bdbb8b3a 100644
--- a/src/setup.ts
+++ b/src/setup.ts
@@ -111,12 +111,19 @@ function minicondaPath(useBundled: boolean = true): string {
 }
 
 /**
- * Provide cross platform location of conda executable
+ * Provide cross platform location of conda/mamba executable
  */
-function condaExecutable(useBundled: boolean): string {
+function condaExecutable(
+  useBundled: boolean,
+  useMamba: boolean = false
+): string {
   const dir: string = minicondaPath(useBundled);
   let condaExe: string;
-  condaExe = IS_UNIX ? `${dir}/condabin/conda` : `${dir}\\condabin\\conda.bat`;
+  let commandName: string;
+  commandName = useMamba ? "mamba" : "conda";
+  condaExe = IS_UNIX
+    ? `${dir}/condabin/${commandName}`
+    : `${dir}\\condabin\\${commandName}.bat`;
   return condaExe;
 }
 
@@ -282,8 +289,12 @@ async function installMiniconda(
 /**
  * Run Conda command
  */
-async function condaCommand(cmd: string, useBundled: boolean): Promise<Result> {
-  const command = `${condaExecutable(useBundled)} ${cmd}`;
+async function condaCommand(
+  cmd: string,
+  useBundled: boolean,
+  useMamba: boolean = false
+): Promise<Result> {
+  const command = `${condaExecutable(useBundled, useMamba)} ${cmd}`;
   return await execute(command);
 }
 
@@ -312,7 +323,8 @@ async function setVariables(useBundled: boolean): Promise<Result> {
  */
 async function createTestEnvironment(
   activateEnvironment: string,
-  useBundled: boolean
+  useBundled: boolean,
+  useMamba: boolean
 ): Promise<Result> {
   let result: Result;
   if (
@@ -324,7 +336,8 @@ async function createTestEnvironment(
       utils.consoleLog("Create test environment...");
       result = await condaCommand(
         `create --name ${activateEnvironment}`,
-        useBundled
+        useBundled,
+        useMamba
       );
       if (!result.ok) return result;
     }
@@ -419,7 +432,7 @@ async function condaInit(
   // Run conda init
   core.info("\n");
   for (let cmd of ["--all"]) {
-    const command = `${condaExecutable(useBundled)} init ${cmd}`;
+    const command = `${condaExecutable(useBundled, false)} init ${cmd}`;
     await execute(command);
   }
 
@@ -522,11 +535,13 @@ conda activate ${activateEnvironment}`;
 async function setupPython(
   activateEnvironment: string,
   pythonVersion: string,
-  useBundled: boolean
+  useBundled: boolean,
+  useMamba: boolean
 ): Promise<Result> {
   return await condaCommand(
     `install --name ${activateEnvironment} python=${pythonVersion}`,
-    useBundled
+    useBundled,
+    useMamba
   );
 }
 
@@ -550,24 +565,26 @@ async function applyCondaConfiguration(
           for (channel of channels) {
             result = await condaCommand(
               `config --add ${key} ${channel}`,
-              useBundled
+              useBundled,
+              false
             );
             if (!result.ok) return result;
           }
         } else {
           result = await condaCommand(
             `config --set ${key} ${condaConfig[key]}`,
-            useBundled
+            useBundled,
+            false
           );
           if (!result.ok) return result;
         }
       }
     }
 
-    result = await condaCommand(`config --show-sources`, useBundled);
+    result = await condaCommand(`config --show-sources`, useBundled, false);
     if (!result.ok) return result;
 
-    result = await condaCommand(`config --show`, useBundled);
+    result = await condaCommand(`config --show`, useBundled, false);
     if (!result.ok) return result;
   } catch (err) {
     return { ok: false, error: err };
@@ -589,10 +606,12 @@ async function setupMiniconda(
   environmentFile: string,
   condaConfigFile: string,
   condaConfig: TCondaConfig,
-  removeProfiles: string
+  removeProfiles: string,
+  mambaVersion: string
 ): Promise<Result> {
   let result: Result;
   let useBundled: boolean = true;
+  let useMamba: boolean = false;
   try {
     // Check for consistency
     if (condaConfig["auto_update_conda"] == "true" && condaVersion) {
@@ -608,6 +627,14 @@ async function setupMiniconda(
         )
       };
     }
+    if (!condaConfig["channels"].includes("conda-forge") && mambaVersion) {
+      return {
+        ok: false,
+        error: new Error(
+          `"mamba-version=${mambaVersion}" requires "conda-forge" to be included in "channels!"`
+        )
+      };
+    }
 
     if (installerUrl !== "") {
       if (minicondaVersion !== "") {
@@ -680,7 +707,8 @@ async function setupMiniconda(
     cacheFolder = cacheFolder.replace("~", os.homedir().replace("\\", "/"));
     result = await condaCommand(
       `config --add pkgs_dirs ${cacheFolder}`,
-      useBundled
+      useBundled,
+      useMamba
     );
     if (!result.ok) return result;
     core.exportVariable("CONDA_PKGS_DIR", cacheFolder);
@@ -707,7 +735,8 @@ async function setupMiniconda(
     utils.consoleLog("Setup Conda basic configuration...");
     result = await condaCommand(
       "config --set always_yes yes --set changeps1 no",
-      useBundled
+      useBundled,
+      useMamba
     );
     if (!result.ok) return result;
 
@@ -724,14 +753,15 @@ async function setupMiniconda(
       utils.consoleLog("Installing Conda...");
       result = await condaCommand(
         `install --name base conda=${condaVersion}`,
-        useBundled
+        useBundled,
+        useMamba
       );
       if (!result.ok) return result;
     }
 
     if (condaConfig["auto_update_conda"] == "true") {
       utils.consoleLog("Updating conda...");
-      result = await condaCommand("update conda", useBundled);
+      result = await condaCommand("update conda", useBundled, useMamba);
       if (!result.ok) return result;
 
       if (condaConfig) {
@@ -742,17 +772,41 @@ async function setupMiniconda(
     }
 
     // Any conda commands run here after init and setup
+    if (mambaVersion) {
+      utils.consoleLog("Installing Mamba...");
+      core.warning(
+        `Mamba support is still experimental and can result in differently solved environments!`
+      );
+      if (mambaVersion) {
+        result = await condaCommand(
+          `install --name base mamba=${mambaVersion}`,
+          useBundled,
+          useMamba
+        );
+      }
+      if (result.ok) {
+        useMamba = true;
+      } else {
+        return result;
+      }
+    }
+
     if (condaBuildVersion) {
       utils.consoleLog("Installing Conda Build...");
       result = await condaCommand(
         `install --name base conda-build=${condaBuildVersion}`,
-        useBundled
+        useBundled,
+        useMamba
       );
       if (!result.ok) return result;
     }
 
     if (activateEnvironment) {
-      result = await createTestEnvironment(activateEnvironment, useBundled);
+      result = await createTestEnvironment(
+        activateEnvironment,
+        useBundled,
+        useMamba
+      );
       if (!result.ok) return result;
     }
 
@@ -763,7 +817,8 @@ async function setupMiniconda(
       result = await setupPython(
         activateEnvironment,
         pythonVersion,
-        useBundled
+        useBundled,
+        useMamba
       );
       if (!result.ok) return result;
     }
@@ -803,7 +858,8 @@ async function setupMiniconda(
       }
       result = await condaCommand(
         `env ${condaAction} -f ${environmentFile}`,
-        useBundled
+        useBundled,
+        useMamba
       );
       if (!result.ok) return result;
     }
@@ -844,6 +900,9 @@ async function run(): Promise<void> {
     let showChannelUrls: string = core.getInput("show-channel-urls");
     let useOnlyTarBz2: string = core.getInput("use-only-tar-bz2");
 
+    // Mamba
+    let mambaVersion: string = core.getInput("mamba-version");
+
     const condaConfig: TCondaConfig = {
       add_anaconda_token: addAnacondaToken,
       add_pip_as_python_dependency: addPipAsPythonDependency,
@@ -867,7 +926,8 @@ async function run(): Promise<void> {
       environmentFile,
       condaFile,
       condaConfig,
-      removeProfiles
+      removeProfiles,
+      mambaVersion
     );
     if (!result.ok) {
       throw result.error;