diff --git a/packages/contracts-bedrock/src/L2/ICrossL2Inbox.sol b/packages/contracts-bedrock/src/L2/ICrossL2Inbox.sol
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+++ b/packages/contracts-bedrock/src/L2/ICrossL2Inbox.sol
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+/// @title ICrossL2Inbox
+/// @notice Interface for the CrossL2Inbox contract.
+interface ICrossL2Inbox {
+    /// @notice The struct for a pointer to a message payload in a remote (or local) chain.
+    struct Identifier {
+        address origin;
+        uint256 blocknumber;
+        uint256 logIndex;
+        uint256 timestamp;
+        uint256 chainId;
+    }
+
+    /// @notice Returns the origin address of the Identifier.
+    /// @return _origin The origin address of the Identifier.
+    function origin() external view returns (address _origin);
+
+    /// @notice Returns the block number of the Identifier.
+    /// @return _blocknumber The block number of the Identifier.
+    function blocknumber() external view returns (uint256 _blocknumber);
+
+    /// @notice Returns the log index of the Identifier.
+    /// @return _logIndex The log index of the Identifier.
+    function logIndex() external view returns (uint256 _logIndex);
+
+    /// @notice Returns the timestamp of the Identifier.
+    /// @return _timestamp The timestamp of the Identifier.
+    function timestamp() external view returns (uint256 _timestamp);
+
+    /// @notice Returns the chain ID of the Identifier.
+    /// @return _chainId The chain ID of the Identifier.
+    function chainId() external view returns (uint256 _chainId);
+
+    /// @notice Executes a cross chain message on the destination chain.
+    /// @param _id An Identifier pointing to the initiating message.
+    /// @param _target Account that is called with _msg.
+    /// @param _msg The message payload, matching the initiating message.
+    function executeMessage(
+        ICrossL2Inbox.Identifier calldata _id,
+        address _target,
+        bytes calldata _msg
+    )
+        external
+        payable;
+}