diff --git a/packages/astro/e2e/fixtures/actions-blog/src/actions/index.ts b/packages/astro/e2e/fixtures/actions-blog/src/actions/index.ts
index 01b479b2b9..e4730367aa 100644
--- a/packages/astro/e2e/fixtures/actions-blog/src/actions/index.ts
+++ b/packages/astro/e2e/fixtures/actions-blog/src/actions/index.ts
@@ -76,7 +76,7 @@ export const server = {
 		}),
 	},
 	sum: defineAction({
-		accept: 'form',
+		accept: 'search',
 		input: z.object({
 			a: z.number(),
 			b: z.number(),
diff --git a/packages/astro/src/actions/runtime/virtual/server.ts b/packages/astro/src/actions/runtime/virtual/server.ts
index 47decf18e5..38aa2b7257 100644
--- a/packages/astro/src/actions/runtime/virtual/server.ts
+++ b/packages/astro/src/actions/runtime/virtual/server.ts
@@ -27,7 +27,7 @@ import {
 
 export * from './shared.js';
 
-export type ActionAccept = 'form' | 'json';
+export type ActionAccept = 'form' | 'json' | 'search';
 
 export type ActionHandler<TInputSchema, TOutput> = TInputSchema extends z.ZodType
 	? (input: z.infer<TInputSchema>, context: ActionAPIContext) => MaybePromise<TOutput>
@@ -78,7 +78,9 @@ export function defineAction<
 	const serverHandler =
 		accept === 'form'
 			? getFormServerHandler(handler, inputSchema)
-			: getJsonServerHandler(handler, inputSchema);
+			: accept === 'search'
+				? getSearchServerHandler(handler, inputSchema)
+				: getJsonServerHandler(handler, inputSchema);
 
 	async function safeServerHandler(this: ActionAPIContext, unparsedInput: unknown) {
 		// The ActionAPIContext should always contain the `params` property
@@ -148,9 +150,36 @@ function getJsonServerHandler<TOutput, TInputSchema extends z.ZodType>(
 	};
 }
 
+function getSearchServerHandler<TOutput, TInputSchema extends z.ZodType>(
+	handler: ActionHandler<TInputSchema, TOutput>,
+	inputSchema?: TInputSchema,
+) {
+	return async (unparsedInput: unknown, context: ActionAPIContext): Promise<Awaited<TOutput>> => {
+		if (!(unparsedInput instanceof URLSearchParams)) {
+			throw new ActionError({
+				code: 'UNSUPPORTED_MEDIA_TYPE',
+				message: 'This action only accepts URLSearchParams.',
+			});
+		}
+
+		if (!inputSchema) return await handler(unparsedInput, context);
+
+		const baseSchema = unwrapBaseObjectSchema(inputSchema, unparsedInput);
+		const parsed = await inputSchema.safeParseAsync(
+			baseSchema instanceof z.ZodObject
+				? formDataToObject(unparsedInput, baseSchema)
+				: unparsedInput,
+		);
+		if (!parsed.success) {
+			throw new ActionInputError(parsed.error.issues);
+		}
+		return await handler(parsed.data, context);
+	};
+}
+
 /** Transform form data to an object based on a Zod schema. */
 export function formDataToObject<T extends z.AnyZodObject>(
-	formData: FormData,
+	formData: FormData | URLSearchParams,
 	schema: T,
 ): Record<string, unknown> {
 	const obj: Record<string, unknown> =
@@ -187,7 +216,7 @@ export function formDataToObject<T extends z.AnyZodObject>(
 
 function handleFormDataGetAll(
 	key: string,
-	formData: FormData,
+	formData: FormData | URLSearchParams,
 	validator: z.ZodArray<z.ZodUnknown>,
 ) {
 	const entries = Array.from(formData.getAll(key));
@@ -202,7 +231,7 @@ function handleFormDataGetAll(
 
 function handleFormDataGet(
 	key: string,
-	formData: FormData,
+	formData: FormData | URLSearchParams,
 	validator: unknown,
 	baseValidator: unknown,
 ) {
@@ -213,7 +242,7 @@ function handleFormDataGet(
 	return validator instanceof z.ZodNumber ? Number(value) : value;
 }
 
-function unwrapBaseObjectSchema(schema: z.ZodType, unparsedInput: FormData) {
+function unwrapBaseObjectSchema(schema: z.ZodType, unparsedInput: FormData | URLSearchParams) {
 	while (schema instanceof z.ZodEffects || schema instanceof z.ZodPipeline) {
 		if (schema instanceof z.ZodEffects) {
 			schema = schema._def.schema;
diff --git a/packages/astro/templates/actions.mjs b/packages/astro/templates/actions.mjs
index 82a287448a..2cf7e41abb 100644
--- a/packages/astro/templates/actions.mjs
+++ b/packages/astro/templates/actions.mjs
@@ -67,8 +67,15 @@ async function handleAction(param, path, context) {
 	// When running client-side, make a fetch request to the action path.
 	const headers = new Headers();
 	headers.set('Accept', 'application/json');
-	let body = param;
-	if (!(body instanceof FormData)) {
+	let method = 'POST'
+	let search = ''
+	let body
+	if (param instanceof URLSearchParams) {
+		method = 'GET'
+		search = `?${param.toString()}`
+	} else if (param instanceof FormData) {
+		body = param
+	} else {
 		try {
 			body = JSON.stringify(param);
 		} catch (e) {
@@ -83,8 +90,8 @@ async function handleAction(param, path, context) {
 			headers.set('Content-Length', '0');
 		}
 	}
-	const rawResult = await fetch(`${import.meta.env.BASE_URL.replace(/\/$/, '')}/_actions/${path}`, {
-		method: 'POST',
+	const rawResult = await fetch(`${import.meta.env.BASE_URL.replace(/\/$/, '')}/_actions/${path}${search}`, {
+		method,
 		body,
 		headers,
 	});
diff --git a/packages/astro/test/actions.test.js b/packages/astro/test/actions.test.js
index d8da4e72e3..d99f60d9fa 100644
--- a/packages/astro/test/actions.test.js
+++ b/packages/astro/test/actions.test.js
@@ -254,8 +254,22 @@ describe('Astro Actions', () => {
 			assert.equal($('#user').text(), 'Houston');
 		});
 
+		it('Supports URLSearchParams', async () => {
+			const req = new Request('http://example.com/_actions/getUserProperty?property=name', {
+				method: 'GET',
+			});
+
+			const res = await app.render(req);
+
+			assert.equal(res.ok, true);
+			assert.equal(res.headers.get('Content-Type'), 'application/json+devalue');
+
+			const data = devalue.parse(await res.text());
+			assert.deepEqual(data, 'Houston');
+		});
+
 		it('Respects custom errors - POST', async () => {
-			const req = new Request('http://example.com/user-or-throw?_action=getUserOrThrow', {
+			const req = new Request('http://example.com/user-or-throw?_astroAction=getUserOrThrow', {
 				method: 'POST',
 				body: new FormData(),
 				headers: {
diff --git a/packages/astro/test/fixtures/actions/src/actions/index.ts b/packages/astro/test/fixtures/actions/src/actions/index.ts
index d3cd1b1bba..ffb9381912 100644
--- a/packages/astro/test/fixtures/actions/src/actions/index.ts
+++ b/packages/astro/test/fixtures/actions/src/actions/index.ts
@@ -75,6 +75,14 @@ export const server = {
 			return locals.user;
 		},
 	}),
+	getUserProperty: defineAction({
+		accept: 'search',
+		input: z
+			.object({ property: z.string() }),
+		handler: async (input, { locals }) => {
+			return locals.user[input.property];
+		},
+	}),
 	validatePassword: defineAction({
 		accept: 'form',
 		input: z
diff --git a/packages/astro/test/types/define-action-accept.ts b/packages/astro/test/types/define-action-accept.ts
index c9a9ca315a..7f81511827 100644
--- a/packages/astro/test/types/define-action-accept.ts
+++ b/packages/astro/test/types/define-action-accept.ts
@@ -18,6 +18,7 @@ describe('defineAction accept', () => {
 		expectTypeOf(jsonAction).parameter(0).toBeAny();
 		expectTypeOf(jsonAction).parameter(0).not.toEqualTypeOf<FormData>();
 	});
+
 	it('accepts type `FormData` when input is omitted with accept form', async () => {
 		const action = defineAction({
 			accept: 'form',
@@ -26,6 +27,14 @@ describe('defineAction accept', () => {
 		expectTypeOf(action).parameter(0).toEqualTypeOf<FormData>();
 	});
 
+	it('accepts type `URLSearchParams` when input is omitted with accept form', async () => {
+		const action = defineAction({
+			accept: 'search',
+			handler: () => {},
+		});
+		expectTypeOf(action).parameter(0).toEqualTypeOf<URLSearchParams>();
+	});
+
 	it('accept type safe values for input with accept json', async () => {
 		const action = defineAction({
 			input: z.object({ name: z.string() }),
@@ -42,4 +51,13 @@ describe('defineAction accept', () => {
 		});
 		expectTypeOf(action).parameter(0).toEqualTypeOf<FormData>();
 	});
+
+	it('accepts type `URLSearchParams` for all inputs with accept form', async () => {
+		const action = defineAction({
+			accept: 'form',
+			input: z.object({ name: z.string() }),
+			handler: () => {},
+		});
+		expectTypeOf(action).parameter(0).toEqualTypeOf<URLSearchParams>();
+	});
 });