diff --git a/.changeset/chilled-cars-remember.md b/.changeset/chilled-cars-remember.md
new file mode 100644
index 0000000000..c175033d8e
--- /dev/null
+++ b/.changeset/chilled-cars-remember.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added multicall3 to Rootstock Testnet chain
diff --git a/src/chains/definitions/rootstockTestnet.ts b/src/chains/definitions/rootstockTestnet.ts
index 83229a8f4b..5d0da0d1c9 100644
--- a/src/chains/definitions/rootstockTestnet.ts
+++ b/src/chains/definitions/rootstockTestnet.ts
@@ -18,5 +18,11 @@ export const rootstockTestnet = /*#__PURE__*/ defineChain({
       url: 'https://explorer.testnet.rootstock.io',
     },
   },
+  contracts: {
+    multicall3: {
+      address: '0xcA11bde05977b3631167028862bE2a173976CA11',
+      blockCreated: 2771150,
+    },
+  },
   testnet: true,
 })