diff --git a/Cargo.lock b/Cargo.lock
index 02bb79be5d20..0fde23ac095c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2928,6 +2928,7 @@ dependencies = [
  "alloy-providers",
  "alloy-rpc-types",
  "alloy-sol-types",
+ "base64 0.21.7",
  "const-hex",
  "ethers-core",
  "ethers-signers",
diff --git a/Cargo.toml b/Cargo.toml
index 730355287dc3..21acb389c2b5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -178,6 +178,7 @@ protobuf = "=3.2.0"
 rand = "0.8"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = { version = "1.0", features = ["arbitrary_precision"] }
+base64 = "0.21"
 toml = "0.8"
 tracing = "0.1"
 tracing-subscriber = "0.3"
diff --git a/crates/cheatcodes/Cargo.toml b/crates/cheatcodes/Cargo.toml
index bb000f5c3198..7225111fed4d 100644
--- a/crates/cheatcodes/Cargo.toml
+++ b/crates/cheatcodes/Cargo.toml
@@ -34,5 +34,6 @@ itertools.workspace = true
 jsonpath_lib.workspace = true
 revm.workspace = true
 serde_json.workspace = true
+base64.workspace = true
 tracing.workspace = true
 walkdir = "2"
diff --git a/crates/cheatcodes/assets/cheatcodes.json b/crates/cheatcodes/assets/cheatcodes.json
index 8b69d7e257cc..fea491981baf 100644
--- a/crates/cheatcodes/assets/cheatcodes.json
+++ b/crates/cheatcodes/assets/cheatcodes.json
@@ -4533,6 +4533,46 @@
       "status": "stable",
       "safety": "unsafe"
     },
+    {
+      "func": {
+        "id": "toBase64",
+        "description": "Encodes a `bytes` value to base64 string",
+        "declaration": "function toBase64(bytes calldata data) external pure returns (string memory);",
+        "visibility": "external",
+        "mutability": "pure",
+        "signature": "toBase64(bytes)",
+        "selector": "0xa5cbfe65",
+        "selectorBytes": [
+          165,
+          203,
+          254,
+          101
+        ]
+      },
+      "group": "base64",
+      "status": "stable",
+      "safety": "safe"
+    },
+    {
+      "func": {
+        "id": "toBase64URL",
+        "description": "Encodes a `bytes` value to base64url string",
+        "declaration": "function toBase64URL(bytes calldata data) external pure returns (string memory);",
+        "visibility": "external",
+        "mutability": "pure",
+        "signature": "toBase64URL(bytes)",
+        "selector": "0xc8bd0e4a",
+        "selectorBytes": [
+          200,
+          189,
+          14,
+          74
+        ]
+      },
+      "group": "base64",
+      "status": "stable",
+      "safety": "safe"
+    },
     {
       "func": {
         "id": "toString_0",
diff --git a/crates/cheatcodes/assets/cheatcodes.schema.json b/crates/cheatcodes/assets/cheatcodes.schema.json
index 7b68420ad63b..1231ec0458e6 100644
--- a/crates/cheatcodes/assets/cheatcodes.schema.json
+++ b/crates/cheatcodes/assets/cheatcodes.schema.json
@@ -298,6 +298,13 @@
             "json"
           ]
         },
+        {
+          "description": "Utility cheatcodes that deal with encoding and decoding Base64.\n\nExamples: `toBase64`, `toBase64URL`.\n\nSafety: safe.",
+          "type": "string",
+          "enum": [
+            "base64"
+          ]
+        },
         {
           "description": "Generic, uncategorized utilities.\n\nExamples: `toString`, `parse*`, `serialize*`.\n\nSafety: safe.",
           "type": "string",
diff --git a/crates/cheatcodes/spec/src/cheatcode.rs b/crates/cheatcodes/spec/src/cheatcode.rs
index f7e0c87b306f..e6ed724629fe 100644
--- a/crates/cheatcodes/spec/src/cheatcode.rs
+++ b/crates/cheatcodes/spec/src/cheatcode.rs
@@ -103,6 +103,12 @@ pub enum Group {
     ///
     /// Safety: safe.
     Json,
+    /// Utility cheatcodes that deal with encoding and decoding Base64.
+    ///
+    /// Examples: `toBase64`, `toBase64URL`.
+    ///
+    /// Safety: safe.
+    Base64,
     /// Generic, uncategorized utilities.
     ///
     /// Examples: `toString`, `parse*`, `serialize*`.
@@ -125,6 +131,7 @@ impl Group {
             Self::Environment |
             Self::String |
             Self::Json |
+            Self::Base64 |
             Self::Utilities => Some(Safety::Safe),
         }
     }
@@ -140,6 +147,7 @@ impl Group {
             Self::Environment => "environment",
             Self::String => "string",
             Self::Json => "json",
+            Self::Base64 => "base64",
             Self::Utilities => "utilities",
         }
     }
diff --git a/crates/cheatcodes/spec/src/vm.rs b/crates/cheatcodes/spec/src/vm.rs
index 1577e6189b84..819ddd41ceaf 100644
--- a/crates/cheatcodes/spec/src/vm.rs
+++ b/crates/cheatcodes/spec/src/vm.rs
@@ -1228,6 +1228,16 @@ interface Vm {
     #[cheatcode(group = Json)]
     function writeJson(string calldata json, string calldata path, string calldata valueKey) external;
 
+    // -------- Base64 --------
+
+    /// Encodes a `bytes` value to base64 string
+    #[cheatcode(group = Base64)]
+    function toBase64(bytes calldata data) external pure returns (string memory);
+
+    /// Encodes a `bytes` value to base64url string
+    #[cheatcode(group = Base64)]
+    function toBase64URL(bytes calldata data) external pure returns (string memory);
+
     // -------- Key Management --------
 
     /// Derives a private key from the name, labels the account with that name, and returns the wallet.
diff --git a/crates/cheatcodes/src/base64.rs b/crates/cheatcodes/src/base64.rs
new file mode 100644
index 000000000000..d9d0bc86f76c
--- /dev/null
+++ b/crates/cheatcodes/src/base64.rs
@@ -0,0 +1,17 @@
+use crate::{Cheatcode, Cheatcodes, Result, Vm::*};
+use alloy_sol_types::SolValue;
+use base64::prelude::*;
+
+impl Cheatcode for toBase64Call {
+    fn apply(&self, _state: &mut Cheatcodes) -> Result {
+        let Self { data } = self;
+        Ok(BASE64_STANDARD.encode(data).abi_encode())
+    }
+}
+
+impl Cheatcode for toBase64URLCall {
+    fn apply(&self, _state: &mut Cheatcodes) -> Result {
+        let Self { data } = self;
+        Ok(BASE64_URL_SAFE.encode(data).abi_encode())
+    }
+}
diff --git a/crates/cheatcodes/src/lib.rs b/crates/cheatcodes/src/lib.rs
index b7a401c074a8..856467f2990d 100644
--- a/crates/cheatcodes/src/lib.rs
+++ b/crates/cheatcodes/src/lib.rs
@@ -26,6 +26,7 @@ pub use config::CheatsConfig;
 mod inspector;
 pub use inspector::{BroadcastableTransaction, BroadcastableTransactions, Cheatcodes, Context};
 
+mod base64;
 mod env;
 mod evm;
 mod fs;
diff --git a/testdata/cheats/Base64.t.sol b/testdata/cheats/Base64.t.sol
new file mode 100644
index 000000000000..88b792cb2991
--- /dev/null
+++ b/testdata/cheats/Base64.t.sol
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+pragma solidity 0.8.18;
+
+import "ds-test/test.sol";
+import "./Vm.sol";
+import "../logs/console.sol";
+
+contract Base64Test is DSTest {
+    Vm constant vm = Vm(HEVM_ADDRESS);
+
+    function test_toBase64() public {
+        bytes memory input = hex"00112233445566778899aabbccddeeff";
+        string memory expected = "ABEiM0RVZneImaq7zN3u/w==";
+        string memory actual = vm.toBase64(input);
+        assertEq(actual, expected);
+    }
+
+    function test_toBase64URL() public {
+        bytes memory input = hex"00112233445566778899aabbccddeeff";
+        string memory expected = "ABEiM0RVZneImaq7zN3u_w==";
+        string memory actual = vm.toBase64URL(input);
+        assertEq(actual, expected);
+    }
+}
diff --git a/testdata/cheats/Vm.sol b/testdata/cheats/Vm.sol
index cc9a1aa8ab22..86afd8d06d2b 100644
--- a/testdata/cheats/Vm.sol
+++ b/testdata/cheats/Vm.sol
@@ -224,6 +224,8 @@ interface Vm {
     function stopMappingRecording() external;
     function stopPrank() external;
     function store(address target, bytes32 slot, bytes32 value) external;
+    function toBase64(bytes calldata data) external pure returns (string memory);
+    function toBase64URL(bytes calldata data) external pure returns (string memory);
     function toString(address value) external pure returns (string memory stringifiedValue);
     function toString(bytes calldata value) external pure returns (string memory stringifiedValue);
     function toString(bytes32 value) external pure returns (string memory stringifiedValue);