diff --git a/.changeset/pink-donuts-agree.md b/.changeset/pink-donuts-agree.md
new file mode 100644
index 0000000000..8fbc21196a
--- /dev/null
+++ b/.changeset/pink-donuts-agree.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Deprecated Flow Previewnet.
diff --git a/src/chains/index.ts b/src/chains/index.ts
index 061d826364..deea68fd13 100644
--- a/src/chains/index.ts
+++ b/src/chains/index.ts
@@ -108,6 +108,7 @@ export { filecoinCalibration } from './definitions/filecoinCalibration.js'
 export { filecoinHyperspace } from './definitions/filecoinHyperspace.js'
 export { flare } from './definitions/flare.js'
 export { flareTestnet } from './definitions/flareTestnet.js'
+/** @deprecated */
 export { flowPreviewnet } from './definitions/flowPreviewnet.js'
 export { flowMainnet } from './definitions/flowMainnet.js'
 export { flowTestnet } from './definitions/flowTestnet.js'