diff --git a/.changeset/yellow-glasses-sort.md b/.changeset/yellow-glasses-sort.md
new file mode 100644
index 0000000000..bd4c461ac1
--- /dev/null
+++ b/.changeset/yellow-glasses-sort.md
@@ -0,0 +1,5 @@
+---
+"@react-router/dev": patch
+---
+
+Fix duplicated entries in typegen for layout routes and their corresponding index route
diff --git a/packages/react-router-dev/typegen/index.ts b/packages/react-router-dev/typegen/index.ts
index b49d06bdd8..4436adac2f 100644
--- a/packages/react-router-dev/typegen/index.ts
+++ b/packages/react-router-dev/typegen/index.ts
@@ -103,6 +103,12 @@ function register(ctx: Context) {
 
   const { t } = Babel;
 
+  const indexPaths = new Set(
+    Object.values(ctx.config.routes)
+      .filter((route) => route.index)
+      .map((route) => route.path)
+  );
+
   const typeParams = t.tsTypeAliasDeclaration(
     t.identifier("Params"),
     null,
@@ -112,6 +118,9 @@ function register(ctx: Context) {
           // filter out pathless (layout) routes
           if (route.id !== "root" && !route.path) return undefined;
 
+          // filter out layout routes that have a corresponding index
+          if (!route.index && indexPaths.has(route.path)) return undefined;
+
           const lineage = Route.lineage(ctx.config.routes, route);
           const fullpath = Route.fullpath(lineage);
           const params = Params.parse(fullpath);