diff --git a/tests/benchmarks/components/api/bench_list_entities.cpp b/tests/benchmarks/components/api/bench_list_entities.cpp
new file mode 100644
index 00000000000..02cef50d705
--- /dev/null
+++ b/tests/benchmarks/components/api/bench_list_entities.cpp
@@ -0,0 +1,235 @@
+#include <benchmark/benchmark.h>
+
+#include "esphome/components/api/api_pb2.h"
+#include "esphome/components/api/api_buffer.h"
+#include "esphome/components/light/color_mode.h"
+
+namespace esphome::api::benchmarks {
+
+static constexpr int kInnerIterations = 2000;
+
+// --- ListEntitiesSensorResponse ---
+
+static ListEntitiesSensorResponse make_sensor_response() {
+  ListEntitiesSensorResponse msg;
+  msg.object_id = StringRef::from_lit("living_room_temperature");
+  msg.key = 0x12345678;
+  msg.name = StringRef::from_lit("Living Room Temperature");
+#ifdef USE_ENTITY_ICON
+  msg.icon = StringRef::from_lit("mdi:thermometer");
+#endif
+  msg.entity_category = enums::ENTITY_CATEGORY_NONE;
+  msg.disabled_by_default = false;
+  msg.unit_of_measurement = StringRef::from_lit("°C");
+  msg.accuracy_decimals = 1;
+  msg.force_update = false;
+  msg.device_class = StringRef::from_lit("temperature");
+  msg.state_class = enums::STATE_CLASS_MEASUREMENT;
+#ifdef USE_DEVICES
+  msg.device_id = 1;
+#endif
+  return msg;
+}
+
+static void CalculateSize_ListEntitiesSensorResponse(benchmark::State &state) {
+  auto msg = make_sensor_response();
+
+  for (auto _ : state) {
+    uint32_t result = 0;
+    for (int i = 0; i < kInnerIterations; i++) {
+      result += msg.calculate_size();
+    }
+    benchmark::DoNotOptimize(result);
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(CalculateSize_ListEntitiesSensorResponse);
+
+static void Encode_ListEntitiesSensorResponse(benchmark::State &state) {
+  auto msg = make_sensor_response();
+  APIBuffer buffer;
+  uint32_t size = msg.calculate_size();
+  buffer.resize(size);
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      ProtoWriteBuffer writer(&buffer, 0);
+      msg.encode(writer);
+    }
+    benchmark::DoNotOptimize(buffer.data());
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(Encode_ListEntitiesSensorResponse);
+
+static void CalcAndEncode_ListEntitiesSensorResponse(benchmark::State &state) {
+  auto msg = make_sensor_response();
+  APIBuffer buffer;
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      uint32_t size = msg.calculate_size();
+      buffer.resize(size);
+      ProtoWriteBuffer writer(&buffer, 0);
+      msg.encode(writer);
+    }
+    benchmark::DoNotOptimize(buffer.data());
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(CalcAndEncode_ListEntitiesSensorResponse);
+
+// --- ListEntitiesBinarySensorResponse ---
+
+static ListEntitiesBinarySensorResponse make_binary_sensor_response() {
+  ListEntitiesBinarySensorResponse msg;
+  msg.object_id = StringRef::from_lit("front_door_contact");
+  msg.key = 0xAABBCCDD;
+  msg.name = StringRef::from_lit("Front Door Contact");
+#ifdef USE_ENTITY_ICON
+  msg.icon = StringRef::from_lit("mdi:door");
+#endif
+  msg.entity_category = enums::ENTITY_CATEGORY_NONE;
+  msg.disabled_by_default = false;
+  msg.device_class = StringRef::from_lit("door");
+  msg.is_status_binary_sensor = false;
+#ifdef USE_DEVICES
+  msg.device_id = 2;
+#endif
+  return msg;
+}
+
+static void CalculateSize_ListEntitiesBinarySensorResponse(benchmark::State &state) {
+  auto msg = make_binary_sensor_response();
+
+  for (auto _ : state) {
+    uint32_t result = 0;
+    for (int i = 0; i < kInnerIterations; i++) {
+      result += msg.calculate_size();
+    }
+    benchmark::DoNotOptimize(result);
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(CalculateSize_ListEntitiesBinarySensorResponse);
+
+static void Encode_ListEntitiesBinarySensorResponse(benchmark::State &state) {
+  auto msg = make_binary_sensor_response();
+  APIBuffer buffer;
+  uint32_t size = msg.calculate_size();
+  buffer.resize(size);
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      ProtoWriteBuffer writer(&buffer, 0);
+      msg.encode(writer);
+    }
+    benchmark::DoNotOptimize(buffer.data());
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(Encode_ListEntitiesBinarySensorResponse);
+
+static void CalcAndEncode_ListEntitiesBinarySensorResponse(benchmark::State &state) {
+  auto msg = make_binary_sensor_response();
+  APIBuffer buffer;
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      uint32_t size = msg.calculate_size();
+      buffer.resize(size);
+      ProtoWriteBuffer writer(&buffer, 0);
+      msg.encode(writer);
+    }
+    benchmark::DoNotOptimize(buffer.data());
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(CalcAndEncode_ListEntitiesBinarySensorResponse);
+
+// --- ListEntitiesLightResponse ---
+
+static light::ColorModeMask light_color_modes;
+static FixedVector<const char *> light_effects;
+
+static ListEntitiesLightResponse make_light_response() {
+  // Initialize static data on first call
+  static bool initialized = false;
+  if (!initialized) {
+    light_color_modes.insert(light::ColorMode::RGB_WHITE);
+    light_color_modes.insert(light::ColorMode::COLOR_TEMPERATURE);
+    light_effects.init(3);
+    light_effects.push_back("None");
+    light_effects.push_back("Rainbow");
+    light_effects.push_back("Strobe");
+    initialized = true;
+  }
+
+  ListEntitiesLightResponse msg;
+  msg.object_id = StringRef::from_lit("kitchen_ceiling_light");
+  msg.key = 0x55667788;
+  msg.name = StringRef::from_lit("Kitchen Ceiling Light");
+#ifdef USE_ENTITY_ICON
+  msg.icon = StringRef::from_lit("mdi:ceiling-light");
+#endif
+  msg.entity_category = enums::ENTITY_CATEGORY_NONE;
+  msg.disabled_by_default = false;
+  msg.supported_color_modes = &light_color_modes;
+  msg.min_mireds = 153.0f;
+  msg.max_mireds = 500.0f;
+  msg.effects = &light_effects;
+#ifdef USE_DEVICES
+  msg.device_id = 3;
+#endif
+  return msg;
+}
+
+static void CalculateSize_ListEntitiesLightResponse(benchmark::State &state) {
+  auto msg = make_light_response();
+
+  for (auto _ : state) {
+    uint32_t result = 0;
+    for (int i = 0; i < kInnerIterations; i++) {
+      result += msg.calculate_size();
+    }
+    benchmark::DoNotOptimize(result);
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(CalculateSize_ListEntitiesLightResponse);
+
+static void Encode_ListEntitiesLightResponse(benchmark::State &state) {
+  auto msg = make_light_response();
+  APIBuffer buffer;
+  uint32_t size = msg.calculate_size();
+  buffer.resize(size);
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      ProtoWriteBuffer writer(&buffer, 0);
+      msg.encode(writer);
+    }
+    benchmark::DoNotOptimize(buffer.data());
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(Encode_ListEntitiesLightResponse);
+
+static void CalcAndEncode_ListEntitiesLightResponse(benchmark::State &state) {
+  auto msg = make_light_response();
+  APIBuffer buffer;
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      uint32_t size = msg.calculate_size();
+      buffer.resize(size);
+      ProtoWriteBuffer writer(&buffer, 0);
+      msg.encode(writer);
+    }
+    benchmark::DoNotOptimize(buffer.data());
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(CalcAndEncode_ListEntitiesLightResponse);
+
+}  // namespace esphome::api::benchmarks