Wellawatta South Grama Niladhari Division is a Grama Niladhari Division of the Thimbirigasyaya Divisional Secretariat of Colombo District of Western Province, Sri Lanka. St. Lawrence's Church, Wellawatte, Mount-Lavinia and Wellawatte are located within, nearby or associated with Wellawatta South. Wellawatta South is a surrounded by the Dehiwala West, , , and Grama Niladhari Divisions.