diff --git a/README.md b/README.md
index c8d960d38..c5d18a663 100644
--- a/README.md
+++ b/README.md
@@ -110,6 +110,7 @@ Validator                               | Description
 **isHash(str, algorithm)**              | check if the string is a hash of type algorithm.<br/><br/>Algorithm is one of `['md4', 'md5', 'sha1', 'sha256', 'sha384', 'sha512', 'ripemd128', 'ripemd160', 'tiger128', 'tiger160', 'tiger192', 'crc32', 'crc32b']`
 **isHexadecimal(str)**                  | check if the string is a hexadecimal number.
 **isHexColor(str)**                     | check if the string is a hexadecimal color.
+**isHSL(str)**                          | check if the string is an HSL (hue, saturation, lightness, optional alpha) color based on [CSS Colors Level 4 specification](https://developer.mozilla.org/en-US/docs/Web/CSS/color_value).<br/><br/>Comma-separated format supported. Space-separated format supported with the exception of a few edge cases (ex: `hsl(200grad+.1%62%/1)`).
 **isRgbColor(str, [, includePercentValues])**                     | check if the string is a rgb or rgba color.<br/><br/>`includePercentValues` defaults to `true`. If you don't want to allow to set `rgb` or `rgba` values with percents, like `rgb(5%,5%,5%)`, or `rgba(90%,90%,90%,.3)`, then set it to false.
 **isIdentityCard(str [, locale])**      | check if the string is a valid identity card code.<br/><br/>`locale` is one of `['ES', 'zh-TW', 'he-IL']` OR `'any'`. If 'any' is used, function will check if any of the locals match.<br/><br/>Defaults to 'any'.
 **isIn(str, values)**                   | check if the string is in a array of allowed values.
@@ -187,8 +188,8 @@ In general, we follow the "fork-and-pull" Git workflow.
 2. Clone the project to your own machine
 3. Work on your fork
     1. Make your changes and additions
-        - Most of your changes should be focused on `src/` and `test/` folders and/or `README.md`. 
-        - Files such as `validator.js`, `validator.min.js` and files in `lib/` folder are autogenerated when running tests (`npm test`) and need not to be changed **manually**. 
+        - Most of your changes should be focused on `src/` and `test/` folders and/or `README.md`.
+        - Files such as `validator.js`, `validator.min.js` and files in `lib/` folder are autogenerated when running tests (`npm test`) and need not to be changed **manually**.
     2. Change or add tests if needed
     3. Run tests and make sure they pass
     4. Add changes to README.md if needed
diff --git a/src/index.js b/src/index.js
index 68645f78e..42549f1b4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -41,6 +41,7 @@ import isDivisibleBy from './lib/isDivisibleBy';
 
 import isHexColor from './lib/isHexColor';
 import isRgbColor from './lib/isRgbColor';
+import isHSL from './lib/isHSL';
 
 import isISRC from './lib/isISRC';
 
@@ -155,6 +156,7 @@ const validator = {
   isDivisibleBy,
   isHexColor,
   isRgbColor,
+  isHSL,
   isISRC,
   isMD5,
   isHash,
diff --git a/src/lib/isHSL.js b/src/lib/isHSL.js
new file mode 100644
index 000000000..b4f446334
--- /dev/null
+++ b/src/lib/isHSL.js
@@ -0,0 +1,10 @@
+import assertString from './util/assertString';
+
+
+const hslcomma = /^(hsl)a?\(\s*((\+|\-)?([0-9]+(\.[0-9]+)?(e(\+|\-)?[0-9]+)?|\.[0-9]+(e(\+|\-)?[0-9]+)?))(deg|grad|rad|turn|\s*)(\s*,\s*(\+|\-)?([0-9]+(\.[0-9]+)?(e(\+|\-)?[0-9]+)?|\.[0-9]+(e(\+|\-)?[0-9]+)?)%){2}\s*(,\s*((\+|\-)?([0-9]+(\.[0-9]+)?(e(\+|\-)?[0-9]+)?|\.[0-9]+(e(\+|\-)?[0-9]+)?)%?)\s*)?\)$/i;
+const hslspace = /^(hsl)a?\(\s*((\+|\-)?([0-9]+(\.[0-9]+)?(e(\+|\-)?[0-9]+)?|\.[0-9]+(e(\+|\-)?[0-9]+)?))(deg|grad|rad|turn|\s)(\s*(\+|\-)?([0-9]+(\.[0-9]+)?(e(\+|\-)?[0-9]+)?|\.[0-9]+(e(\+|\-)?[0-9]+)?)%){2}\s*(\/\s*((\+|\-)?([0-9]+(\.[0-9]+)?(e(\+|\-)?[0-9]+)?|\.[0-9]+(e(\+|\-)?[0-9]+)?)%?)\s*)?\)$/i;
+
+export default function isHSL(str) {
+  assertString(str);
+  return hslcomma.test(str) || hslspace.test(str);
+}
diff --git a/test/validators.js b/test/validators.js
index b5e413403..d87a1889e 100644
--- a/test/validators.js
+++ b/test/validators.js
@@ -3126,6 +3126,54 @@ describe('Validators', () => {
     });
   });
 
+  it('should validate HSL color strings', () => {
+    test({
+      validator: 'isHSL',
+      valid: [
+        'hsl(360,0000000000100%,000000100%)',
+        'hsl(000010, 00000000001%, 00000040%)',
+        'HSL(00000,0000000000100%,000000100%)',
+        'hsL(0, 0%, 0%)',
+        'hSl(  360  , 100%  , 100%   )',
+        'Hsl(  00150  , 000099%  , 01%   )',
+        'hsl(01080, 03%, 4%)',
+        'hsl(-540, 03%, 4%)',
+        'hsla(+540, 03%, 4%)',
+        'hsla(+540, 03%, 4%, 500)',
+        'hsl(+540deg, 03%, 4%, 500)',
+        'hsl(+540gRaD, 03%, 4%, 500)',
+        'hsl(+540.01e-98rad, 03%, 4%, 500)',
+        'hsl(-540.5turn, 03%, 4%, 500)',
+        'hsl(+540, 03%, 4%, 500e-01)',
+        'hsl(+540, 03%, 4%, 500e+80)',
+        'hsl(4.71239rad, 60%, 70%)',
+        'hsl(270deg, 60%, 70%)',
+        'hsl(200, +.1%, 62%, 1)',
+        'hsl(270 60% 70%)',
+        'hsl(200, +.1e-9%, 62e10%, 1)',
+        'hsl(.75turn, 60%, 70%)',
+        // 'hsl(200grad+.1%62%/1)', //supposed to pass, but need to handle delimiters
+        'hsl(200grad +.1% 62% / 1)',
+        'hsl(270, 60%, 50%, .15)',
+        'hsl(270, 60%, 50%, 15%)',
+        'hsl(270 60% 50% / .15)',
+        'hsl(270 60% 50% / 15%)',
+      ],
+      invalid: [
+        'hsl (360,0000000000100%,000000100%)',
+        'hsl(0260, 100 %, 100%)',
+        'hsl(0160, 100%, 100%, 100 %)',
+        'hsl(-0160, 100%, 100a)',
+        'hsl(-0160, 100%, 100)',
+        'hsl(-0160 100%, 100%, )',
+        'hsl(270 deg, 60%, 70%)',
+        'hsl( deg, 60%, 70%)',
+        'hsl(, 60%, 70%)',
+        'hsl(3000deg, 70%)',
+      ],
+    });
+  });
+
   it('should validate rgb color strings', () => {
     test({
       validator: 'isRgbColor',