diff --git a/.changeset/gentle-jokes-rule.md b/.changeset/gentle-jokes-rule.md
new file mode 100644
index 0000000000..0c92e7a6ee
--- /dev/null
+++ b/.changeset/gentle-jokes-rule.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added Flow previewnet evm network
diff --git a/src/chains/definitions/flowMainnet.ts b/src/chains/definitions/flowMainnet.ts
new file mode 100644
index 0000000000..2531fd3ac0
--- /dev/null
+++ b/src/chains/definitions/flowMainnet.ts
@@ -0,0 +1,22 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const flowMainnet= /*#__PURE__*/ defineChain({
+  id: 747,
+  name: 'FlowEVM Mainnet',
+  nativeCurrency: {
+    decimals: 18,
+    name: 'Flow',
+    symbol: 'FLOW',
+  },
+  rpcUrls: {
+    default: {
+        http: ['https://mainnet.evm.nodes.onflow.org']
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Mainnet Explorer',
+      url: 'https://flowdiver.io',
+    },
+  },
+})
diff --git a/src/chains/definitions/flowPreviewnet.ts b/src/chains/definitions/flowPreviewnet.ts
new file mode 100644
index 0000000000..fa4d51466a
--- /dev/null
+++ b/src/chains/definitions/flowPreviewnet.ts
@@ -0,0 +1,22 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const flowPreviewnet = /*#__PURE__*/ defineChain({
+  id: 646,
+  name: 'FlowEVM Previewnet',
+  nativeCurrency: {
+    decimals: 18,
+    name: 'Flow',
+    symbol: 'FLOW',
+  },
+  rpcUrls: {
+    default: {
+        http: ['https://previewnet.evm.nodes.onflow.org']
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Previewnet Explorer',
+      url: 'https://previewnet.flowdiver.io',
+    },
+  },
+})
diff --git a/src/chains/index.ts b/src/chains/index.ts
index c932052402..b0f13cb335 100644
--- a/src/chains/index.ts
+++ b/src/chains/index.ts
@@ -72,6 +72,8 @@ export { filecoinCalibration } from './definitions/filecoinCalibration.js'
 export { filecoinHyperspace } from './definitions/filecoinHyperspace.js'
 export { flare } from './definitions/flare.js'
 export { flareTestnet } from './definitions/flareTestnet.js'
+export { flowPreviewnet } from './definitions/flowPreviewnet.js'
+export { flowMainnet } from './definitions/flowMainnet.js'
 /** @deprecated Use `anvil` instead. */
 export { foundry } from './definitions/foundry.js'
 export { fraxtal } from './definitions/fraxtal.js'