diff --git a/.changeset/loud-carrots-smash.md b/.changeset/loud-carrots-smash.md
new file mode 100644
index 0000000000..8b6769b9bf
--- /dev/null
+++ b/.changeset/loud-carrots-smash.md
@@ -0,0 +1,5 @@
+---
+"create-t3-app": minor
+---
+
+rename index.ts to \_app.ts
diff --git a/cli/src/installers/trpc.ts b/cli/src/installers/trpc.ts
index 6567400109..3fcbe8da07 100644
--- a/cli/src/installers/trpc.ts
+++ b/cli/src/installers/trpc.ts
@@ -50,13 +50,11 @@ export const trpcInstaller: Installer = ({ projectDir, packages }) => {
     "src/server/trpc/router/auth.ts",
   );
 
-  const indexRouterFile = usingAuth
-    ? "auth-index-router.ts"
-    : "index-router.ts";
+  const indexRouterFile = usingAuth ? "auth-app-router.ts" : "app-router.ts";
   const indexRouterSrc = path.join(trpcAssetDir, indexRouterFile);
   const indexRouterDest = path.join(
     projectDir,
-    "src/server/trpc/router/index.ts",
+    "src/server/trpc/router/_app.ts",
   );
 
   const exampleRouterFile = usingPrisma
diff --git a/cli/template/addons/trpc/api-handler.ts b/cli/template/addons/trpc/api-handler.ts
index 8d800b8167..0d33fef5c8 100644
--- a/cli/template/addons/trpc/api-handler.ts
+++ b/cli/template/addons/trpc/api-handler.ts
@@ -1,6 +1,6 @@
 // src/pages/api/trpc/[trpc].ts
 import { createNextApiHandler } from "@trpc/server/adapters/next";
-import { appRouter } from "../../../server/trpc/router";
+import { appRouter } from "../../../server/trpc/router/_app";
 import { createContext } from "../../../server/trpc/context";
 import { env } from "../../../env/server.mjs";
 
diff --git a/cli/template/addons/trpc/index-router.ts b/cli/template/addons/trpc/app-router.ts
similarity index 87%
rename from cli/template/addons/trpc/index-router.ts
rename to cli/template/addons/trpc/app-router.ts
index 8b28185428..71f4cbca72 100644
--- a/cli/template/addons/trpc/index-router.ts
+++ b/cli/template/addons/trpc/app-router.ts
@@ -1,4 +1,4 @@
-// src/server/router/index.ts
+// src/server/router/_app.ts
 import { router } from "../trpc";
 
 import { exampleRouter } from "./example";
diff --git a/cli/template/addons/trpc/auth-index-router.ts b/cli/template/addons/trpc/auth-app-router.ts
similarity index 88%
rename from cli/template/addons/trpc/auth-index-router.ts
rename to cli/template/addons/trpc/auth-app-router.ts
index 147ddd2b9b..7d12ca4f06 100644
--- a/cli/template/addons/trpc/auth-index-router.ts
+++ b/cli/template/addons/trpc/auth-app-router.ts
@@ -1,4 +1,4 @@
-// src/server/trpc/router/index.ts
+// src/server/trpc/router/_app.ts
 import { router } from "../trpc";
 import { exampleRouter } from "./example";
 import { authRouter } from "./auth";
diff --git a/cli/template/addons/trpc/utils.ts b/cli/template/addons/trpc/utils.ts
index f79d2bd7e4..52a4f3072b 100644
--- a/cli/template/addons/trpc/utils.ts
+++ b/cli/template/addons/trpc/utils.ts
@@ -1,7 +1,7 @@
 // src/utils/trpc.ts
 import { httpBatchLink, loggerLink } from "@trpc/client";
 import { createTRPCNext } from "@trpc/next";
-import type { AppRouter } from "../server/trpc/router";
+import type { AppRouter } from "../server/trpc/router/_app";
 import superjson from "superjson";
 
 const getBaseUrl = () => {
diff --git a/www/src/pages/en/usage/trpc.md b/www/src/pages/en/usage/trpc.md
index e14a7f9455..13dbe5ec32 100644
--- a/www/src/pages/en/usage/trpc.md
+++ b/www/src/pages/en/usage/trpc.md
@@ -54,7 +54,7 @@ What does this snippet do? It's a tRPC procedure (the equivalent of a route hand
 You define your procedures in `routers` which represent a collection of related procedures with a shared namespace. You may have one router for `users`, one for `posts` and another one for `messages`. These routers can then be merged into a single, centralized `appRouter`:
 
 ```ts
-// server/routers/index.ts
+// server/routers/_app.ts
 const appRouter = t.router({
   users: userRouter,
   posts: postRouter,