diff --git a/.changeset/big-spoons-grab.md b/.changeset/big-spoons-grab.md
new file mode 100644
index 00000000000..ab0ddcd25df
--- /dev/null
+++ b/.changeset/big-spoons-grab.md
@@ -0,0 +1,5 @@
+---
+"@remix-run/dev": minor
+---
+
+allow defining multiple routes for the same route module file
diff --git a/contributors.yml b/contributors.yml
index 54b97030a01..18c8c6b362d 100644
--- a/contributors.yml
+++ b/contributors.yml
@@ -257,6 +257,7 @@
 - lpsinger
 - lswest
 - lucasdibz
+- lucasferreira
 - luispagarcia
 - luisrivas
 - luistak
diff --git a/packages/remix-dev/__tests__/defineRoutes-test.ts b/packages/remix-dev/__tests__/defineRoutes-test.ts
index d4766d004f5..dbd73350dfa 100644
--- a/packages/remix-dev/__tests__/defineRoutes-test.ts
+++ b/packages/remix-dev/__tests__/defineRoutes-test.ts
@@ -87,4 +87,80 @@ describe("defineRoutes", () => {
       }
     `);
   });
+
+  it("allows multiple routes with the same route module", () => {
+    let routes = defineRoutes((route) => {
+      route("/user/:id", "routes/index.tsx", { id: "user-by-id" });
+      route("/user", "routes/index.tsx", { id: "user" });
+      route("/other", "routes/other-route.tsx");
+    });
+
+    expect(routes).toMatchInlineSnapshot(`
+      Object {
+        "routes/other-route": Object {
+          "caseSensitive": undefined,
+          "file": "routes/other-route.tsx",
+          "id": "routes/other-route",
+          "index": undefined,
+          "parentId": undefined,
+          "path": "/other",
+        },
+        "user": Object {
+          "caseSensitive": undefined,
+          "file": "routes/index.tsx",
+          "id": "user",
+          "index": undefined,
+          "parentId": undefined,
+          "path": "/user",
+        },
+        "user-by-id": Object {
+          "caseSensitive": undefined,
+          "file": "routes/index.tsx",
+          "id": "user-by-id",
+          "index": undefined,
+          "parentId": undefined,
+          "path": "/user/:id",
+        },
+      }
+    `);
+  });
+
+  it("throws an error on route id collisions", () => {
+    // Two conflicting custom id's
+    let defineNonUniqueRoutes = () => {
+      defineRoutes((route) => {
+        route("/user/:id", "routes/user.tsx", { id: "user" });
+        route("/user", "routes/user.tsx", { id: "user" });
+        route("/other", "routes/other-route.tsx");
+      });
+    };
+
+    expect(defineNonUniqueRoutes).toThrowErrorMatchingInlineSnapshot(
+      `"Unable to define routes with duplicate route id: \\"user\\""`
+    );
+
+    // Custom id conflicting with a later-defined auto-generated id
+    defineNonUniqueRoutes = () => {
+      defineRoutes((route) => {
+        route("/user/:id", "routes/user.tsx", { id: "routes/user" });
+        route("/user", "routes/user.tsx");
+      });
+    };
+
+    expect(defineNonUniqueRoutes).toThrowErrorMatchingInlineSnapshot(
+      `"Unable to define routes with duplicate route id: \\"routes/user\\""`
+    );
+
+    // Custom id conflicting with an earlier-defined auto-generated id
+    defineNonUniqueRoutes = () => {
+      defineRoutes((route) => {
+        route("/user", "routes/user.tsx");
+        route("/user/:id", "routes/user.tsx", { id: "routes/user" });
+      });
+    };
+
+    expect(defineNonUniqueRoutes).toThrowErrorMatchingInlineSnapshot(
+      `"Unable to define routes with duplicate route id: \\"routes/user\\""`
+    );
+  });
 });
diff --git a/packages/remix-dev/compiler/assets.ts b/packages/remix-dev/compiler/assets.ts
index af02d83233c..60be5b6da73 100644
--- a/packages/remix-dev/compiler/assets.ts
+++ b/packages/remix-dev/compiler/assets.ts
@@ -56,10 +56,13 @@ export async function createAssetsManifest(
     config.appDirectory,
     config.entryClientFile
   );
-  let routesByFile: Map<string, Route> = Object.keys(config.routes).reduce(
+  let routesByFile: Map<string, Route[]> = Object.keys(config.routes).reduce(
     (map, key) => {
       let route = config.routes[key];
-      map.set(route.file, route);
+      map.set(
+        route.file,
+        map.has(route.file) ? [...map.get(route.file), route] : [route]
+      );
       return map;
     },
     new Map()
@@ -83,22 +86,27 @@ export async function createAssetsManifest(
         /(^browser-route-module:|\?browser$)/g,
         ""
       );
-      let route = routesByFile.get(entryPointFile);
-      invariant(route, `Cannot get route for entry point ${output.entryPoint}`);
-      let sourceExports = await getRouteModuleExports(config, route.id);
-      routes[route.id] = {
-        id: route.id,
-        parentId: route.parentId,
-        path: route.path,
-        index: route.index,
-        caseSensitive: route.caseSensitive,
-        module: resolveUrl(key),
-        imports: resolveImports(output.imports),
-        hasAction: sourceExports.includes("action"),
-        hasLoader: sourceExports.includes("loader"),
-        hasCatchBoundary: sourceExports.includes("CatchBoundary"),
-        hasErrorBoundary: sourceExports.includes("ErrorBoundary"),
-      };
+      let groupedRoute = routesByFile.get(entryPointFile);
+      invariant(
+        groupedRoute,
+        `Cannot get route(s) for entry point ${output.entryPoint}`
+      );
+      for (let route of groupedRoute) {
+        let sourceExports = await getRouteModuleExports(config, route.id);
+        routes[route.id] = {
+          id: route.id,
+          parentId: route.parentId,
+          path: route.path,
+          index: route.index,
+          caseSensitive: route.caseSensitive,
+          module: resolveUrl(key),
+          imports: resolveImports(output.imports),
+          hasAction: sourceExports.includes("action"),
+          hasLoader: sourceExports.includes("loader"),
+          hasCatchBoundary: sourceExports.includes("CatchBoundary"),
+          hasErrorBoundary: sourceExports.includes("ErrorBoundary"),
+        };
+      }
     }
   }
 
diff --git a/packages/remix-dev/config/routes.ts b/packages/remix-dev/config/routes.ts
index 9d97158d03f..7f1e5696ef3 100644
--- a/packages/remix-dev/config/routes.ts
+++ b/packages/remix-dev/config/routes.ts
@@ -54,6 +54,12 @@ export interface DefineRouteOptions {
    * Should be `true` if this is an index route that does not allow child routes.
    */
   index?: boolean;
+
+  /**
+   * An optional unique id string for this route. Use this if you need to aggregate
+   * two or more routes with the same route file.
+   */
+  id?: string;
 }
 
 interface DefineRouteChildren {
@@ -141,7 +147,7 @@ export function defineRoutes(
       path: path ? path : undefined,
       index: options.index ? true : undefined,
       caseSensitive: options.caseSensitive ? true : undefined,
-      id: createRouteId(file),
+      id: options.id || createRouteId(file),
       parentId:
         parentRoutes.length > 0
           ? parentRoutes[parentRoutes.length - 1].id
@@ -149,6 +155,12 @@ export function defineRoutes(
       file,
     };
 
+    if (route.id in routes) {
+      throw new Error(
+        `Unable to define routes with duplicate route id: "${route.id}"`
+      );
+    }
+
     routes[route.id] = route;
 
     if (children) {