diff --git a/redfish-core/include/redfish.hpp b/redfish-core/include/redfish.hpp
index ab635f9..ed42b89 100644
--- a/redfish-core/include/redfish.hpp
+++ b/redfish-core/include/redfish.hpp
@@ -44,6 +44,7 @@
 #include "../lib/task.hpp"
 #include "../lib/telemetry_service.hpp"
 #include "../lib/thermal.hpp"
+#include "../lib/thermal_subsystem.hpp"
 #include "../lib/trigger.hpp"
 #include "../lib/update_service.hpp"
 #include "../lib/virtual_media.hpp"
@@ -76,6 +77,9 @@
         requestRoutesThermal(app);
         requestRoutesPower(app);
 #endif
+#ifdef BMCWEB_NEW_POWERSUBSYSTEM_THERMALSUBSYSTEM
+        requestRoutesThermalSubsystem(app);
+#endif
         requestRoutesManagerCollection(app);
         requestRoutesManager(app);
         requestRoutesManagerResetAction(app);
diff --git a/redfish-core/lib/chassis.hpp b/redfish-core/lib/chassis.hpp
index 7982281..f1de38c 100644
--- a/redfish-core/lib/chassis.hpp
+++ b/redfish-core/lib/chassis.hpp
@@ -384,6 +384,11 @@
                 asyncResp->res.jsonValue["Power"]["@odata.id"] =
                     "/redfish/v1/Chassis/" + chassisId + "/Power";
 #endif
+#ifdef BMCWEB_NEW_POWERSUBSYSTEM_THERMALSUBSYSTEM
+                asyncResp->res.jsonValue["ThermalSubsystem"]["@odata.id"] =
+                    crow::utility::urlFromPieces("redfish", "v1", "Chassis",
+                                                 chassisId, "ThermalSubsystem");
+#endif
                 // SensorCollection
                 asyncResp->res.jsonValue["Sensors"]["@odata.id"] =
                     "/redfish/v1/Chassis/" + chassisId + "/Sensors";
diff --git a/redfish-core/lib/thermal_subsystem.hpp b/redfish-core/lib/thermal_subsystem.hpp
new file mode 100644
index 0000000..0d5b88b
--- /dev/null
+++ b/redfish-core/lib/thermal_subsystem.hpp
@@ -0,0 +1,59 @@
+#pragma once
+
+#include "app.hpp"
+#include "query.hpp"
+#include "registries/privilege_registry.hpp"
+#include "utils/chassis_utils.hpp"
+#include "utils/json_utils.hpp"
+
+namespace redfish
+{
+
+inline void doThermalSubsystemCollection(
+    const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
+    const std::string& chassisId,
+    const std::optional<std::string>& validChassisPath)
+{
+    if (!validChassisPath)
+    {
+        BMCWEB_LOG_ERROR << "Not a valid chassis ID" << chassisId;
+        messages::resourceNotFound(asyncResp->res, "Chassis", chassisId);
+        return;
+    }
+    asyncResp->res.jsonValue["@odata.type"] =
+        "#ThermalSubsystem.v1_0_0.ThermalSubsystem";
+    asyncResp->res.jsonValue["Name"] = "Thermal Subsystem";
+    asyncResp->res.jsonValue["Id"] = "ThermalSubsystem";
+
+    asyncResp->res.jsonValue["@odata.id"] = crow::utility::urlFromPieces(
+        "redfish", "v1", "Chassis", chassisId, "ThermalSubsystem");
+
+    asyncResp->res.jsonValue["Status"]["State"] = "Enabled";
+    asyncResp->res.jsonValue["Status"]["Health"] = "OK";
+}
+
+inline void handleThermalSubsystemCollectionGet(
+    App& app, const crow::Request& req,
+    const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
+    const std::string& param)
+{
+    if (!redfish::setUpRedfishRoute(app, req, asyncResp))
+    {
+        return;
+    }
+    const std::string& chassisId = param;
+
+    redfish::chassis_utils::getValidChassisPath(
+        asyncResp, chassisId,
+        std::bind_front(doThermalSubsystemCollection, asyncResp, chassisId));
+}
+
+inline void requestRoutesThermalSubsystem(App& app)
+{
+    BMCWEB_ROUTE(app, "/redfish/v1/Chassis/<str>/ThermalSubsystem/")
+        .privileges(redfish::privileges::getThermalSubsystem)
+        .methods(boost::beast::http::verb::get)(std::bind_front(
+            handleThermalSubsystemCollectionGet, std::ref(app)));
+}
+
+} // namespace redfish
diff --git a/redfish-core/lib/ut/thermal_subsystem_test.cpp b/redfish-core/lib/ut/thermal_subsystem_test.cpp
new file mode 100644
index 0000000..c688023
--- /dev/null
+++ b/redfish-core/lib/ut/thermal_subsystem_test.cpp
@@ -0,0 +1,42 @@
+#include "include/async_resp.hpp"
+#include "thermal_subsystem.hpp"
+
+#include <nlohmann/json.hpp>
+
+#include <optional>
+#include <string>
+
+#include <gtest/gtest.h>
+
+namespace redfish
+{
+namespace
+{
+
+constexpr const char* chassisId = "ChassisId";
+constexpr const char* validChassisPath = "ChassisPath";
+
+void assertThemalCollectionGet(crow::Response& res)
+{
+    nlohmann::json& json = res.jsonValue;
+    EXPECT_EQ(json["@odata.type"], "#ThermalSubsystem.v1_0_0.ThermalSubsystem");
+    EXPECT_EQ(json["Name"], "Thermal Subsystem");
+    EXPECT_EQ(json["Id"], "ThermalSubsystem");
+    EXPECT_EQ(json["@odata.id"],
+              "/redfish/v1/Chassis/ChassisId/ThermalSubsystem");
+    EXPECT_EQ(json["Status"]["State"], "Enabled");
+    EXPECT_EQ(json["Status"]["Health"], "OK");
+}
+
+TEST(ThermalSubsystemCollectionTest,
+     ThermalSubsystemCollectionStaticAttributesAreExpected)
+{
+    auto shareAsyncResp = std::make_shared<bmcweb::AsyncResp>();
+    shareAsyncResp->res.setCompleteRequestHandler(assertThemalCollectionGet);
+    doThermalSubsystemCollection(
+        shareAsyncResp, chassisId,
+        std::make_optional<std::string>(validChassisPath));
+}
+
+} // namespace
+} // namespace redfish