diff --git a/.changeset/little-peas-teach.md b/.changeset/little-peas-teach.md
new file mode 100644
index 000000000000..70e73a651a26
--- /dev/null
+++ b/.changeset/little-peas-teach.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-cloudflare': minor
+---
+
+expose select ESBuild options as adapter options
diff --git a/packages/adapter-cloudflare/index.d.ts b/packages/adapter-cloudflare/index.d.ts
index e6fb925ff102..a4223736dd11 100644
--- a/packages/adapter-cloudflare/index.d.ts
+++ b/packages/adapter-cloudflare/index.d.ts
@@ -30,6 +30,20 @@ export interface AdapterOptions {
 		 */
 		exclude?: string[];
 	};
+	/**
+	 * Customize a restricted set of options used by ESBuild to prepare the Cloudflare adapter bundle.
+	 *
+	 * @default {}
+	 */
+	esbuildOptions?: {
+		/**
+		 * Mark a file or a package as external to exclude it from your build.
+		 * Instead of being bundled, the import will be preserved and will be evaluated at run time instead.
+		 *
+		 * @see https://esbuild.github.io/api/#external
+		 */
+		external?: import('esbuild').BuildOptions['external'];
+	};
 }
 
 export interface RoutesJSONSpec {
diff --git a/packages/adapter-cloudflare/index.js b/packages/adapter-cloudflare/index.js
index ccf6887beca8..de0c36d47f1d 100644
--- a/packages/adapter-cloudflare/index.js
+++ b/packages/adapter-cloudflare/index.js
@@ -47,6 +47,7 @@ export default function (options = {}) {
 
 			await esbuild.build({
 				platform: 'browser',
+				external: options?.esbuildOptions?.external,
 				conditions: ['worker', 'browser'],
 				sourcemap: 'linked',
 				target: 'es2022',