diff --git a/core/extension/gdextension_interface.cpp b/core/extension/gdextension_interface.cpp
index 7fbf2d00a16..7ef956a470f 100644
--- a/core/extension/gdextension_interface.cpp
+++ b/core/extension/gdextension_interface.cpp
@@ -726,6 +726,11 @@ static void gdextension_string_operator_plus_eq_c32str(GDExtensionStringPtr p_se
 	*self += p_b;
 }
 
+static GDExtensionInt gdextension_string_resize(GDExtensionStringPtr p_self, GDExtensionInt p_length) {
+	String *self = (String *)p_self;
+	return (*self).resize(p_length);
+}
+
 static GDExtensionInt gdextension_xml_parser_open_buffer(GDExtensionObjectPtr p_instance, const uint8_t *p_buffer, size_t p_size) {
 	XMLParser *xml = (XMLParser *)p_instance;
 	return (GDExtensionInt)xml->_open_buffer(p_buffer, p_size);
@@ -1167,6 +1172,7 @@ void gdextension_setup_interface() {
 	REGISTER_INTERFACE_FUNC(string_operator_plus_eq_cstr);
 	REGISTER_INTERFACE_FUNC(string_operator_plus_eq_wcstr);
 	REGISTER_INTERFACE_FUNC(string_operator_plus_eq_c32str);
+	REGISTER_INTERFACE_FUNC(string_resize);
 	REGISTER_INTERFACE_FUNC(xml_parser_open_buffer);
 	REGISTER_INTERFACE_FUNC(file_access_store_buffer);
 	REGISTER_INTERFACE_FUNC(file_access_get_buffer);
diff --git a/core/extension/gdextension_interface.h b/core/extension/gdextension_interface.h
index 4d7bdf95023..637ecea4b65 100644
--- a/core/extension/gdextension_interface.h
+++ b/core/extension/gdextension_interface.h
@@ -1526,6 +1526,25 @@ typedef void (*GDExtensionInterfaceStringOperatorPlusEqWcstr)(GDExtensionStringP
  */
 typedef void (*GDExtensionInterfaceStringOperatorPlusEqC32str)(GDExtensionStringPtr p_self, const char32_t *p_b);
 
+/**
+ * @name string_resize
+ * @since 4.2
+ *
+ * Resizes the underlying string data to the given number of characters.
+ *
+ * Space needs to be allocated for the null terminating character ('\0') which
+ * also must be added manually, in order for all string functions to work correctly.
+ *
+ * Warning: This is an error-prone operation - only use it if there's no other
+ * efficient way to accomplish your goal.
+ *
+ * @param p_self A pointer to the String.
+ * @param p_resize The new length for the String.
+ *
+ * @return Error code signifying if the operation successful.
+ */
+typedef GDExtensionInt (*GDExtensionInterfaceStringResize)(GDExtensionStringPtr p_self, GDExtensionInt p_resize);
+
 /* INTERFACE: XMLParser Utilities */
 
 /**