diff --git a/contributors.yml b/contributors.yml
index bc025058fe8..dcf809c2ed9 100644
--- a/contributors.yml
+++ b/contributors.yml
@@ -343,6 +343,7 @@
 - philandstuff
 - phishy
 - plastic041
+- pokedotdev
 - plondon
 - princerajroy
 - prvnbist
diff --git a/integration/multiple-pathless-routes-test.ts b/integration/multiple-pathless-routes-test.ts
new file mode 100644
index 00000000000..daa760c688d
--- /dev/null
+++ b/integration/multiple-pathless-routes-test.ts
@@ -0,0 +1,91 @@
+import { test, expect } from "@playwright/test";
+
+import type { Fixture, AppFixture } from "./helpers/create-fixture";
+import { createAppFixture, createFixture, js } from "./helpers/create-fixture";
+
+let fixture: Fixture;
+let appFixture: AppFixture;
+
+const TEXTS = {
+  SLUG_LAYOUT: "Layout: slug",
+  FOO_LAYOUT: "Layout: foo",
+  FOO_CHILD: "deep foo",
+  SLUG_CHILD: "Slug index from foo layout",
+  BAR_LAYOUT: "Layout: bar",
+  BAR_CHILD: "deep bar",
+} as const
+
+test.beforeAll(async () => {
+  fixture = await createFixture({
+    files: {
+      "app/routes/slug.jsx": js`
+        import { Outlet } from "@remix-run/react";
+        export default () => {
+          return (
+            <div>
+              <h1>${TEXTS.SLUG_LAYOUT}</h1>
+              <Outlet/>
+            </div>
+          )
+        }
+      `,
+      "app/routes/slug/__foo.jsx": js`
+        import { Outlet } from "@remix-run/react";
+        export default () => {
+          return (
+            <div>
+              <h2>${TEXTS.FOO_LAYOUT}</h2>
+              <Outlet/>
+            </div>
+          )
+        }
+      `,
+      "app/routes/slug/__foo/foo.jsx": js`
+        export default () => <h3>${TEXTS.FOO_CHILD}</h3>;
+      `,
+      "app/routes/slug/__foo/index.jsx": js`
+        export default () => <h3>${TEXTS.SLUG_CHILD}</h3>;
+      `,
+      "app/routes/slug/__bar.jsx": js`
+        import { Outlet } from "@remix-run/react";
+        export default () => {
+          return (
+            <div>
+              <h2>${TEXTS.BAR_LAYOUT}</h2>
+              <Outlet/>
+            </div>
+          )
+        }
+      `,
+      "app/routes/slug/__bar/bar.jsx": js`
+        export default () => <h3>${TEXTS.BAR_CHILD}</h3>;
+      `,
+    },
+  });
+
+  appFixture = await createAppFixture(fixture);
+});
+
+test.afterAll(async () => appFixture.close());
+
+test("slug index & foo layout", async () => {
+  let res = await fixture.requestDocument("/slug");
+  let text = await res.text();
+  expect(text).toMatch(TEXTS.SLUG_LAYOUT);
+  expect(text).toMatch(TEXTS.FOO_LAYOUT);
+  expect(text).toMatch(TEXTS.SLUG_CHILD);
+});
+
+test("foo layout", async () => {
+  let res = await fixture.requestDocument("/slug/foo");
+  let text = await res.text();
+  expect(text).toMatch(TEXTS.FOO_LAYOUT);
+  expect(text).toMatch(TEXTS.FOO_CHILD);
+});
+
+test("bar layout", async () => {
+  let res = await fixture.requestDocument("/slug/bar");
+  let text = await res.text();
+  expect(text).toMatch(TEXTS.BAR_LAYOUT);
+  expect(text).toMatch(TEXTS.BAR_CHILD);
+});
diff --git a/packages/remix-dev/config/routesConvention.ts b/packages/remix-dev/config/routesConvention.ts
index 4fb5fc3211e..89af8517104 100644
--- a/packages/remix-dev/config/routesConvention.ts
+++ b/packages/remix-dev/config/routesConvention.ts
@@ -62,13 +62,19 @@ export function defineConventionalRoutes(
     );
 
     for (let routeId of childRouteIds) {
-      let routePath: string | undefined = createRoutePath(
-        routeId.slice((parentId || "routes").length + 1)
-      );
+      let lastSegment = routeId.slice((parentId || "routes").length + 1);
+      let routePath: string | undefined = createRoutePath(lastSegment);
 
-      let isIndexRoute = routeId.endsWith("/index");
+      let isIndexRoute = lastSegment === "index";
+      let isLayoutRoute = lastSegment.startsWith("__");
       let fullPath = createRoutePath(routeId.slice("routes".length + 1));
-      let uniqueRouteId = (fullPath || "") + (isIndexRoute ? "?index" : "");
+      let uniqueRouteId = fullPath || "";
+
+      if (isIndexRoute) {
+        uniqueRouteId += "?index";
+      } else if (isLayoutRoute) {
+        uniqueRouteId += lastSegment;
+      }
 
       if (uniqueRouteId) {
         if (uniqueRoutes.has(uniqueRouteId)) {