diff --git a/.changeset/silent-flows-options.md b/.changeset/silent-flows-options.md
new file mode 100644
index 00000000000..fc02ae34b9a
--- /dev/null
+++ b/.changeset/silent-flows-options.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/solid-query': patch
+---
+
+types(solid-query): support optional initialData in infiniteQueryOptions
diff --git a/packages/solid-query/src/__tests__/infiniteQueryOptions.test-d.tsx b/packages/solid-query/src/__tests__/infiniteQueryOptions.test-d.tsx
index be3a19cb97d..e37b0e085e1 100644
--- a/packages/solid-query/src/__tests__/infiniteQueryOptions.test-d.tsx
+++ b/packages/solid-query/src/__tests__/infiniteQueryOptions.test-d.tsx
@@ -136,4 +136,42 @@ describe('infiniteQueryOptions', () => {
       }>
     >()
   })
+
+  it('should infer defined types when initialData is a function that can return undefined', () => {
+    const options = infiniteQueryOptions({
+      queryKey: queryKey(),
+      queryFn: () => ({ wow: true }),
+      initialData: () =>
+        Math.random() > 0.5
+          ? {
+              pageParams: [undefined],
+              pages: [{ wow: true }],
+            }
+          : undefined,
+      getNextPageParam: () => 10,
+      initialPageParam: 0,
+    })
+
+    expectTypeOf(() => useInfiniteQuery(() => options).data).toEqualTypeOf<
+      () => InfiniteData<{ wow: boolean }, unknown> | undefined
+    >()
+  })
+
+  it('should infer defined types when initialData is undefined or defined', () => {
+    const initialData:
+      | InfiniteData<{ wow: boolean }, unknown>
+      | undefined = undefined
+
+    const options = infiniteQueryOptions({
+      queryKey: queryKey(),
+      queryFn: () => ({ wow: true }),
+      initialData,
+      getNextPageParam: () => 10,
+      initialPageParam: 0,
+    })
+
+    expectTypeOf(() => useInfiniteQuery(() => options).data).toEqualTypeOf<
+      () => InfiniteData<{ wow: boolean }, unknown> | undefined
+    >()
+  })
 })
diff --git a/packages/solid-query/src/infiniteQueryOptions.ts b/packages/solid-query/src/infiniteQueryOptions.ts
index 1648882d2f3..45412b32474 100644
--- a/packages/solid-query/src/infiniteQueryOptions.ts
+++ b/packages/solid-query/src/infiniteQueryOptions.ts
@@ -1,6 +1,7 @@
 import type {
   DefaultError,
   InfiniteData,
+  InitialDataFunction,
   NonUndefinedGuard,
   QueryKey,
   QueryKeyWithDataTag,
@@ -16,7 +17,12 @@ export type UndefinedInitialDataInfiniteOptions<
   TPageParam = unknown,
 > = Accessor<
   InfiniteQueryOptions<TQueryFnData, TError, TData, TQueryKey, TPageParam> & {
-    initialData?: undefined
+    initialData?:
+      | undefined
+      | NonUndefinedGuard<InfiniteData<TQueryFnData, TPageParam>>
+      | InitialDataFunction<
+          NonUndefinedGuard<InfiniteData<TQueryFnData, TPageParam>>
+        >
   }
 >