diff --git a/test/common/init/BUILD b/test/common/init/BUILD
index 894e7493aa72..e3b81a8e8a12 100644
--- a/test/common/init/BUILD
+++ b/test/common/init/BUILD
@@ -2,8 +2,10 @@ licenses(["notice"])  # Apache 2
 
 load(
     "//bazel:envoy_build_system.bzl",
+    "envoy_cc_fuzz_test",
     "envoy_cc_test",
     "envoy_package",
+    "envoy_proto_library",
 )
 
 envoy_package()
@@ -32,3 +34,20 @@ envoy_cc_test(
         "//test/mocks/init:init_mocks",
     ],
 )
+
+envoy_proto_library(
+    name = "init_fuzz_proto",
+    srcs = ["init_fuzz.proto"],
+    deps = ["//test/fuzz:common_proto"],
+)
+
+envoy_cc_fuzz_test(
+    name = "init_fuzz_test",
+    srcs = ["init_fuzz_test.cc"],
+    corpus = "init_corpus",
+    deps = [
+        ":init_fuzz_proto_cc_proto",
+        "//source/common/init:manager_lib",
+        "//test/fuzz:utility_lib",
+    ],
+)
diff --git a/test/common/init/init_corpus/m1t1 b/test/common/init/init_corpus/m1t1
new file mode 100644
index 000000000000..066a4b599b28
--- /dev/null
+++ b/test/common/init/init_corpus/m1t1
@@ -0,0 +1,13 @@
+actions {
+    action: INIT_MANAGER_ADD_TARGET
+    param: 1
+}
+
+actions {
+    action: INIT_MANAGER_INITIALIZE
+    param: 1
+}
+actions {
+    action: INIT_TARGET_READY
+    param: 1
+}
\ No newline at end of file
diff --git a/test/common/init/init_fuzz.proto b/test/common/init/init_fuzz.proto
new file mode 100644
index 000000000000..ef8e1b48b61b
--- /dev/null
+++ b/test/common/init/init_fuzz.proto
@@ -0,0 +1,32 @@
+syntax = "proto3";
+
+package test.common.init;
+
+// Structured input for init_fuzz_test.
+
+enum InitEntityAction {
+
+  // manager
+  INIT_MANAGER_CREATION = 0;
+  INIT_MANAGER_INITIALIZE = 1;
+  INIT_MANAGER_DESTRUCTION = 2;
+
+  // target
+  INIT_TARGET_READY = 3;
+  INIT_TARGET_DESTRUCTION = 4;
+
+  // watcher
+  INIT_WATCHER_DESTRUCTION = 5;
+
+  // add
+  INIT_MANAGER_ADD_TARGET = 6;
+}
+
+message InitAction {
+  InitEntityAction action = 1;
+  int32 param = 2;
+}
+
+message InitTestCase {
+  repeated InitAction actions = 1;
+}
diff --git a/test/common/init/init_fuzz_test.cc b/test/common/init/init_fuzz_test.cc
new file mode 100644
index 000000000000..71e247b52ee6
--- /dev/null
+++ b/test/common/init/init_fuzz_test.cc
@@ -0,0 +1,71 @@
+#include "common/common/assert.h"
+#include "common/init/manager_impl.h"
+#include "common/init/target_impl.h"
+#include "common/init/watcher_impl.h"
+
+#include "test/common/init/init_fuzz.pb.h"
+#include "test/fuzz/fuzz_runner.h"
+
+#include "absl/strings/str_cat.h"
+#include "gtest/gtest.h"
+
+namespace Envoy {
+namespace Fuzz {
+namespace {
+using namespace Init;
+
+class InitDriver {
+public:
+  InitDriver(int manager_size, int target_size) {
+    for (int i = 0; i < manager_size; i++) {
+      ms_.emplace_back(std::make_unique<ManagerImpl>(absl::StrCat("fuzz_manager_", i)));
+      ws_.emplace_back(std::make_unique<WatcherImpl>(
+          absl::StrCat("fuzz_watcher_", i), [this, i]() mutable { ready_flags_[i] = true; }));
+      ready_flags_.emplace_back(false);
+    }
+    for (int i = 0; i < target_size; i++) {
+      ts_.emplace_back(std::make_unique<TargetImpl>(absl::StrCat("fuzz_target_", i), []() {}));
+    }
+  }
+
+  void transit(const test::common::init::InitAction& action) {
+    auto param = action.param();
+    int mid = (param % 1);
+    int tid = (param % 1);
+    switch (action.action()) {
+    case test::common::init::INIT_MANAGER_INITIALIZE:
+      ms_[mid]->initialize(*ws_[mid]);
+      break;
+    case test::common::init::INIT_MANAGER_ADD_TARGET:
+
+      ms_[mid]->add(*ts_[tid]);
+      break;
+    case test::common::init::INIT_TARGET_READY:
+
+      ts_[tid]->ready();
+    default:
+      // NOT_IMPLEMENT_YET
+      break;
+    }
+  };
+
+  std::vector<bool> ready_flags_;
+  std::vector<std::unique_ptr<ManagerImpl>> ms_;
+  std::vector<std::unique_ptr<TargetImpl>> ts_;
+  std::vector<std::unique_ptr<WatcherImpl>> ws_;
+};
+
+DEFINE_PROTO_FUZZER(const test::common::init::InitTestCase& input) {
+  if (input.actions_size() < 3) {
+    return;
+  }
+  InitDriver driver(1, 1);
+  ENVOY_LOG_MISC(critical, "input size {}", input.actions_size());
+  for (const auto& act : input.actions()) {
+    driver.transit(act);
+  }
+  RELEASE_ASSERT(driver.ready_flags_[0], "manager not initialized");
+}
+} // namespace
+} // namespace Fuzz
+} // namespace Envoy
\ No newline at end of file