diff --git a/test/common/router/BUILD b/test/common/router/BUILD
index 0fad319d411c8..2e3e0fa41821f 100644
--- a/test/common/router/BUILD
+++ b/test/common/router/BUILD
@@ -377,3 +377,12 @@ envoy_cc_test(
         "//test/mocks/router:router_filter_interface",
     ],
 )
+
+envoy_proto_library(
+    name = "router_fuzz_proto",
+    srcs = ["router_fuzz.proto"],
+    deps = [
+        "//test/fuzz:common_proto",
+        "@envoy_api//envoy/extensions/filters/http/router/v3:pkg",
+    ],
+)
diff --git a/test/common/router/router_fuzz.proto b/test/common/router/router_fuzz.proto
new file mode 100644
index 0000000000000..504bfc7c2705f
--- /dev/null
+++ b/test/common/router/router_fuzz.proto
@@ -0,0 +1,40 @@
+syntax = "proto3";
+
+package test.common.router;
+
+import "validate/validate.proto";
+
+import "google/protobuf/empty.proto";
+
+import "test/fuzz/common.proto";
+
+import "envoy/extensions/filters/http/router/v3/router.proto";
+
+message DirectionalAction {
+  oneof response_action_selector {
+    test.fuzz.Headers headers = 1;
+    uint32 data = 2;
+    test.fuzz.Headers trailers = 3;
+  }
+  bool end_stream = 4;
+}
+
+message StreamAction {
+  oneof stream_action_selector {
+    DirectionalAction request = 1;
+    DirectionalAction response = 2;
+  }
+}
+
+message Action {
+  oneof action_selector {
+    StreamAction stream_action = 1;
+    google.protobuf.Empty advance_time = 2;
+    google.protobuf.Empty force_retry = 3;
+  }
+}
+
+message RouterTestCase {
+  repeated Action actions = 1;
+  envoy.extensions.filters.http.router.v3.Router config = 2;
+}