Wellawatta South Grama Niladhari Division is a Grama Niladhari Division of the Thimbirigasyaya Divisional Secretariat of Colombo District of Western Province, Sri Lanka.

Wellawatta South is a surrounded by the Dehiwala West, Galwala, Sri Saranankara, Pamankada West and Wellawatta North Grama Niladhari Divisions.

The Wellawatta South Grama Niladhari Division has a Sri Lankan Tamil majority (57.3%), a significant Sinhalese population (26.1%) and a significant Moor population (13.8%).

In comparison, the Thimbirigasyaya Divisional Secretariat (which contains the Wellawatta South Grama Niladhari Division) has a Sinhalese majority (52.8%), a significant Sri Lankan Tamil population (28.0%) and a significant Moor population (15.1%)[2] Ethnicity in Wellawatta South[2] The Wellawatta South Grama Niladhari Division has a Hindu majority (53.2%), a significant Buddhist population (20.4%) and a significant Muslim population (15.6%).

In comparison, the Thimbirigasyaya Divisional Secretariat (which contains the Wellawatta South Grama Niladhari Division) has a Buddhist plurality (47.9%), a significant Hindu population (22.5%) and a significant Muslim population (17.4%)[2] Religion in Wellawatta South[2]