diff --git a/core/extension/gdextension.cpp b/core/extension/gdextension.cpp
index 7cba5cb161ef..c402b732a10c 100644
--- a/core/extension/gdextension.cpp
+++ b/core/extension/gdextension.cpp
@@ -614,6 +614,15 @@ void GDExtension::_register_extension_class_signal(GDExtensionClassLibraryPtr p_
 	ClassDB::add_signal(class_name, s);
 }
 
+void GDExtension::_set_extension_class_icon(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringPtr p_icon_path) {
+	GDExtension *self = reinterpret_cast<GDExtension *>(p_library);
+
+	StringName class_name = *reinterpret_cast<const StringName *>(p_class_name);
+	String icon_path = *reinterpret_cast<const String *>(p_icon_path);
+
+	self->class_icon_paths[class_name] = icon_path;
+}
+
 void GDExtension::_unregister_extension_class(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name) {
 	GDExtension *self = reinterpret_cast<GDExtension *>(p_library);
 
@@ -779,6 +788,7 @@ void GDExtension::initialize_gdextensions() {
 	register_interface_function("classdb_register_extension_class_property_group", (GDExtensionInterfaceFunctionPtr)&GDExtension::_register_extension_class_property_group);
 	register_interface_function("classdb_register_extension_class_property_subgroup", (GDExtensionInterfaceFunctionPtr)&GDExtension::_register_extension_class_property_subgroup);
 	register_interface_function("classdb_register_extension_class_signal", (GDExtensionInterfaceFunctionPtr)&GDExtension::_register_extension_class_signal);
+	register_interface_function("classdb_set_extension_class_icon", (GDExtensionInterfaceFunctionPtr)&GDExtension::_set_extension_class_icon);
 	register_interface_function("classdb_unregister_extension_class", (GDExtensionInterfaceFunctionPtr)&GDExtension::_unregister_extension_class);
 	register_interface_function("get_library_path", (GDExtensionInterfaceFunctionPtr)&GDExtension::_get_library_path);
 }
diff --git a/core/extension/gdextension.h b/core/extension/gdextension.h
index 706bc7e18961..cf516eb013ba 100644
--- a/core/extension/gdextension.h
+++ b/core/extension/gdextension.h
@@ -90,6 +90,7 @@ class GDExtension : public Resource {
 	static void _register_extension_class_property_group(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_group_name, GDExtensionConstStringNamePtr p_prefix);
 	static void _register_extension_class_property_subgroup(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_subgroup_name, GDExtensionConstStringNamePtr p_prefix);
 	static void _register_extension_class_signal(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_signal_name, const GDExtensionPropertyInfo *p_argument_info, GDExtensionInt p_argument_count);
+	static void _set_extension_class_icon(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringPtr p_icon_path);
 	static void _unregister_extension_class(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name);
 	static void _get_library_path(GDExtensionClassLibraryPtr p_library, GDExtensionStringPtr r_path);
 
diff --git a/core/extension/gdextension_interface.h b/core/extension/gdextension_interface.h
index 374dbfd07115..b5b22ac5adf2 100644
--- a/core/extension/gdextension_interface.h
+++ b/core/extension/gdextension_interface.h
@@ -2988,6 +2988,18 @@ typedef void (*GDExtensionInterfaceClassdbRegisterExtensionClassPropertySubgroup
  */
 typedef void (*GDExtensionInterfaceClassdbRegisterExtensionClassSignal)(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_signal_name, const GDExtensionPropertyInfo *p_argument_info, GDExtensionInt p_argument_count);
 
+/**
+ * @name classdb_set_extension_class_icon
+ * @since 4.4
+ *
+ * Sets the icon of an extension class in the ClassDB.
+ *
+ * @param p_library A pointer the library received by the GDExtension's entry point function.
+ * @param p_class_name A pointer to a StringName with the class name.
+ * @param p_icon_path A pointer to a String with the path to the icon image.
+ */
+typedef void (*GDExtensionInterfaceClassdbSetExtensionClassIcon)(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringPtr p_icon_path);
+
 /**
  * @name classdb_unregister_extension_class
  * @since 4.1
diff --git a/core/extension/gdextension_manager.cpp b/core/extension/gdextension_manager.cpp
index fff938858fd3..0f02882c9120 100644
--- a/core/extension/gdextension_manager.cpp
+++ b/core/extension/gdextension_manager.cpp
@@ -210,6 +210,10 @@ void GDExtensionManager::initialize_extensions(GDExtension::InitializationLevel
 	ERR_FAIL_COND(int32_t(p_level) - 1 != level);
 	for (KeyValue<String, Ref<GDExtension>> &E : gdextension_map) {
 		E.value->initialize_library(p_level);
+
+		for (const KeyValue<String, String> &kv : E.value->class_icon_paths) {
+			gdextension_class_icon_paths[kv.key] = kv.value;
+		}
 	}
 	level = p_level;
 }