diff --git a/.changeset/real-hairs-walk.md b/.changeset/real-hairs-walk.md
new file mode 100644
index 0000000000..d8ae9f4b01
--- /dev/null
+++ b/.changeset/real-hairs-walk.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added Corn Testnet.
diff --git a/src/chains/definitions/cornTestnet.ts b/src/chains/definitions/cornTestnet.ts
new file mode 100644
index 0000000000..64fb0d10b1
--- /dev/null
+++ b/src/chains/definitions/cornTestnet.ts
@@ -0,0 +1,32 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+const sourceId = 11_155_111 // sepolia
+
+export const cornTestnet = /*#__PURE__*/ defineChain({
+  id: 21_000_001,
+  name: 'Corn Testnet',
+  nativeCurrency: {
+    decimals: 18,
+    name: 'Bitcorn',
+    symbol: 'BTCN',
+  },
+  rpcUrls: {
+    default: { http: ['https://rpc.ankr.com/corn_testnet'] },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Corn Testnet Explorer',
+      url: 'https://testnet.cornscan.io',
+      apiUrl:
+        'https://api.routescan.io/v2/network/testnet/evm/21000001/etherscan/api',
+    },
+  },
+  contracts: {
+    multicall3: {
+      address: '0xcA11bde05977b3631167028862bE2a173976CA11',
+      blockCreated: 4886,
+    },
+  },
+  testnet: true,
+  sourceId,
+})
diff --git a/src/chains/index.ts b/src/chains/index.ts
index 9b2a8fe062..780bb9a899 100644
--- a/src/chains/index.ts
+++ b/src/chains/index.ts
@@ -88,6 +88,7 @@ export { confluxESpace } from './definitions/confluxESpace.js'
 export { confluxESpaceTestnet } from './definitions/confluxESpaceTestnet.js'
 export { coreDao } from './definitions/coreDao.js'
 export { corn } from './definitions/corn.js'
+export { cornTestnet } from './definitions/cornTestnet.js'
 export { crab } from './definitions/crab.js'
 export { cronos } from './definitions/cronos.js'
 export { cronosTestnet } from './definitions/cronosTestnet.js'