diff --git a/packages/core/postgrest-js/src/PostgrestClient.ts b/packages/core/postgrest-js/src/PostgrestClient.ts
index 6cefadd00..dbc11bc60 100644
--- a/packages/core/postgrest-js/src/PostgrestClient.ts
+++ b/packages/core/postgrest-js/src/PostgrestClient.ts
@@ -144,6 +144,15 @@ export default class PostgrestClient<
    *
    * `"estimated"`: Uses exact count for low numbers and planned count for high
    * numbers.
+   *
+   * @example
+   * ```ts
+   * // For cross-schema functions where type inference fails, use overrideTypes:
+   * const { data } = await supabase
+   *   .schema('schema_b')
+   *   .rpc('function_a', {})
+   *   .overrideTypes<{ id: string; user_id: string }[]>()
+   * ```
    */
   rpc<
     FnName extends string & keyof Schema['Functions'],
diff --git a/packages/core/postgrest-js/src/types/common/rpc.ts b/packages/core/postgrest-js/src/types/common/rpc.ts
index 52e57419a..f9b789211 100644
--- a/packages/core/postgrest-js/src/types/common/rpc.ts
+++ b/packages/core/postgrest-js/src/types/common/rpc.ts
@@ -62,6 +62,10 @@ type RpcFunctionNotFound<FnName> = {
   Relationships: null
 }
 
+type CrossSchemaError<TableRef extends string> = {
+  error: true
+} & `Function returns SETOF from a different schema ('${TableRef}'). Use .overrideTypes<YourReturnType>() to specify the return type explicitly.`
+
 export type GetRpcFunctionFilterBuilderByArgs<
   Schema extends GenericSchema,
   FnName extends string & keyof Schema['Functions'],
@@ -98,13 +102,20 @@ export type GetRpcFunctionFilterBuilderByArgs<
   ? // If we are dealing with an non-typed client everything is any
     IsAny<Fn> extends true
     ? { Row: any; Result: any; RelationName: FnName; Relationships: null }
-    : // Otherwise, we use the arguments based function definition narrowing to get the rigt value
+    : // Otherwise, we use the arguments based function definition narrowing to get the right value
       Fn extends GenericFunction
       ? {
           Row: Fn['SetofOptions'] extends GenericSetofOption
-            ? Fn['SetofOptions']['isSetofReturn'] extends true
+            ? Fn['SetofOptions']['to'] extends keyof TablesAndViews<Schema>
               ? TablesAndViews<Schema>[Fn['SetofOptions']['to']]['Row']
-              : TablesAndViews<Schema>[Fn['SetofOptions']['to']]['Row']
+              : // Cross-schema fallback: use Returns type when table is not in current schema
+                Fn['Returns'] extends any[]
+                ? Fn['Returns'][number] extends Record<string, unknown>
+                  ? Fn['Returns'][number]
+                  : CrossSchemaError<Fn['SetofOptions']['to'] & string>
+                : Fn['Returns'] extends Record<string, unknown>
+                  ? Fn['Returns']
+                  : CrossSchemaError<Fn['SetofOptions']['to'] & string>
             : Fn['Returns'] extends any[]
               ? Fn['Returns'][number] extends Record<string, unknown>
                 ? Fn['Returns'][number]
@@ -125,7 +136,9 @@ export type GetRpcFunctionFilterBuilderByArgs<
           Relationships: Fn['SetofOptions'] extends GenericSetofOption
             ? Fn['SetofOptions']['to'] extends keyof Schema['Tables']
               ? Schema['Tables'][Fn['SetofOptions']['to']]['Relationships']
-              : Schema['Views'][Fn['SetofOptions']['to']]['Relationships']
+              : Fn['SetofOptions']['to'] extends keyof Schema['Views']
+                ? Schema['Views'][Fn['SetofOptions']['to']]['Relationships']
+                : null
             : null
         }
       : // If we failed to find the function by argument, we still pass with any but also add an overridable
diff --git a/packages/core/postgrest-js/test/override-types.test-d.ts b/packages/core/postgrest-js/test/override-types.test-d.ts
index c144ad498..367e25b76 100644
--- a/packages/core/postgrest-js/test/override-types.test-d.ts
+++ b/packages/core/postgrest-js/test/override-types.test-d.ts
@@ -548,3 +548,12 @@ const postgrest = new PostgrestClient<Database>(REST_URL)
     >
   >(true)
 }
+
+// Test cross-schema rpc falls back to Returns type
+{
+  const result = await postgrest.schema('personal').rpc('get_public_users', {})
+  if (result.error) {
+    throw new Error(result.error.message)
+  }
+  expectType<TypeEqual<typeof result.data, { id: string; user_id: string }[]>>(true)
+}
diff --git a/packages/core/postgrest-js/test/types.override.ts b/packages/core/postgrest-js/test/types.override.ts
index 1f6568eb0..df1047891 100644
--- a/packages/core/postgrest-js/test/types.override.ts
+++ b/packages/core/postgrest-js/test/types.override.ts
@@ -32,6 +32,18 @@ export type Database = MergeDeep<
           }
         }
       }
+      Functions: {
+        get_public_users: {
+          Args: Record<PropertyKey, never>
+          Returns: { id: string; user_id: string }[]
+          SetofOptions: {
+            from: '*'
+            to: 'public.users'
+            isOneToOne: false
+            isSetofReturn: true
+          }
+        }
+      }
       Views: {}
       Enums: {}
       CompositeTypes: {}
diff --git a/packages/core/supabase-js/src/lib/rest/types/common/rpc.ts b/packages/core/supabase-js/src/lib/rest/types/common/rpc.ts
index fe457bded..25285efe2 100644
--- a/packages/core/supabase-js/src/lib/rest/types/common/rpc.ts
+++ b/packages/core/supabase-js/src/lib/rest/types/common/rpc.ts
@@ -72,6 +72,10 @@ type RpcFunctionNotFound<FnName> = {
   Relationships: null
 }
 
+type CrossSchemaError<TableRef extends string> = {
+  error: true
+} & `Function returns SETOF from a different schema ('${TableRef}'). Use .overrideTypes<YourReturnType>() to specify the return type explicitly.`
+
 export type GetRpcFunctionFilterBuilderByArgs<
   Schema extends GenericSchema,
   FnName extends string & keyof Schema['Functions'],
@@ -108,13 +112,20 @@ export type GetRpcFunctionFilterBuilderByArgs<
   ? // If we are dealing with an non-typed client everything is any
     IsAny<Fn> extends true
     ? { Row: any; Result: any; RelationName: FnName; Relationships: null }
-    : // Otherwise, we use the arguments based function definition narrowing to get the rigt value
+    : // Otherwise, we use the arguments based function definition narrowing to get the right value
       Fn extends GenericFunction
       ? {
           Row: Fn['SetofOptions'] extends GenericSetofOption
-            ? Fn['SetofOptions']['isSetofReturn'] extends true
+            ? Fn['SetofOptions']['to'] extends keyof TablesAndViews<Schema>
               ? TablesAndViews<Schema>[Fn['SetofOptions']['to']]['Row']
-              : TablesAndViews<Schema>[Fn['SetofOptions']['to']]['Row']
+              : // Cross-schema fallback: use Returns type when table is not in current schema
+                Fn['Returns'] extends any[]
+                ? Fn['Returns'][number] extends Record<string, unknown>
+                  ? Fn['Returns'][number]
+                  : CrossSchemaError<Fn['SetofOptions']['to'] & string>
+                : Fn['Returns'] extends Record<string, unknown>
+                  ? Fn['Returns']
+                  : CrossSchemaError<Fn['SetofOptions']['to'] & string>
             : Fn['Returns'] extends any[]
               ? Fn['Returns'][number] extends Record<string, unknown>
                 ? Fn['Returns'][number]
@@ -135,7 +146,9 @@ export type GetRpcFunctionFilterBuilderByArgs<
           Relationships: Fn['SetofOptions'] extends GenericSetofOption
             ? Fn['SetofOptions']['to'] extends keyof Schema['Tables']
               ? Schema['Tables'][Fn['SetofOptions']['to']]['Relationships']
-              : Schema['Views'][Fn['SetofOptions']['to']]['Relationships']
+              : Fn['SetofOptions']['to'] extends keyof Schema['Views']
+                ? Schema['Views'][Fn['SetofOptions']['to']]['Relationships']
+                : null
             : null
         }
       : // If we failed to find the function by argument, we still pass with any but also add an overridable