diff --git a/core/core_bind.cpp b/core/core_bind.cpp
index d42d39a159f..0bf6efc96db 100644
--- a/core/core_bind.cpp
+++ b/core/core_bind.cpp
@@ -315,6 +315,10 @@ Error OS::set_thread_name(const String &p_name) {
 	return ::Thread::get_caller_id();
 };
 
+::Thread::ID OS::get_main_thread_id() const {
+	return ::Thread::get_main_id();
+};
+
 bool OS::has_feature(const String &p_feature) const {
 	return ::OS::get_singleton()->has_feature(p_feature);
 }
@@ -601,6 +605,7 @@ void OS::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("set_thread_name", "name"), &OS::set_thread_name);
 	ClassDB::bind_method(D_METHOD("get_thread_caller_id"), &OS::get_thread_caller_id);
+	ClassDB::bind_method(D_METHOD("get_main_thread_id"), &OS::get_main_thread_id);
 
 	ClassDB::bind_method(D_METHOD("has_feature", "tag_name"), &OS::has_feature);
 
diff --git a/core/core_bind.h b/core/core_bind.h
index 641e3a33ae0..4bacfa720c6 100644
--- a/core/core_bind.h
+++ b/core/core_bind.h
@@ -237,6 +237,7 @@ public:
 
 	Error set_thread_name(const String &p_name);
 	Thread::ID get_thread_caller_id() const;
+	Thread::ID get_main_thread_id() const;
 
 	bool has_feature(const String &p_feature) const;
 
diff --git a/doc/classes/OS.xml b/doc/classes/OS.xml
index dcd41e46f0a..7fb80abbf9d 100644
--- a/doc/classes/OS.xml
+++ b/doc/classes/OS.xml
@@ -246,6 +246,13 @@
 				This can be used to narrow down fully specified locale strings to only the "common" language code, when you don't need the additional information about country code or variants. For example, for a French Canadian user with [code]fr_CA[/code] locale, this would return [code]fr[/code].
 			</description>
 		</method>
+		<method name="get_main_thread_id" qualifiers="const">
+			<return type="int" />
+			<description>
+				Returns the ID of the main thread. See [method get_thread_caller_id].
+				[b]Note:[/b] Thread IDs are not deterministic and may be reused across application restarts.
+			</description>
+		</method>
 		<method name="get_model_name" qualifiers="const">
 			<return type="String" />
 			<description>