diff --git a/.changeset/itchy-pants-impress.md b/.changeset/itchy-pants-impress.md
new file mode 100644
index 0000000000..5469b2c9e6
--- /dev/null
+++ b/.changeset/itchy-pants-impress.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added Arthera Testnet.
diff --git a/src/chains/definitions/artheraTestnet.ts b/src/chains/definitions/artheraTestnet.ts
new file mode 100644
index 0000000000..fd862ede2e
--- /dev/null
+++ b/src/chains/definitions/artheraTestnet.ts
@@ -0,0 +1,25 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const artheraTestnet = /*#__PURE__*/ defineChain({
+  id: 10243,
+  name: 'Arthera Testnet',
+  nativeCurrency: { name: 'Arthera', symbol: 'AA', decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ['https://rpc-test.arthera.net'],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Arthera EVM Explorer',
+      url: 'https://explorer-test.arthera.net',
+      apiUrl: 'https://explorer-test.arthera.net/api',
+    },
+  },
+  contracts: {
+    multicall3: {
+      address: '0xca11bde05977b3631167028862be2a173976ca11',
+      blockCreated: 22051,
+    },
+  },
+})
diff --git a/src/chains/index.ts b/src/chains/index.ts
index f5819299bf..3ab32d1962 100644
--- a/src/chains/index.ts
+++ b/src/chains/index.ts
@@ -23,6 +23,7 @@ export { areonNetwork } from './definitions/areonNetwork.js'
 export { areonNetworkTestnet } from './definitions/areonNetworkTestnet.js'
 export { artelaTestnet } from './definitions/artelaTestnet.js'
 export { arthera } from './definitions/arthera.js'
+export { artheraTestnet } from './definitions/artheraTestnet.js'
 export { assetChain } from './definitions/assetChain.js'
 export { assetChainTestnet } from './definitions/assetChainTestnet.js'
 export { astar } from './definitions/astar.js'