The Township of Perth South is a lower-tier municipality in southwestern Ontario, Canada. It is located in the County of Perth at the confluence of the River Thames and the Avon River. The Township was created on January 1, 1998 as a result of an amalgamation of the former Township of Blanshard and the former Township of Downie.

Canada's ninth Prime Minister, Arthur Meighen, was born in Anderson, a community in Perth South.

The township encompasses the Villages of Sebringville and Kirkton. There are smaller settlement areas knows as Hamlets that include: Avonbank, Avonton, Conroy, Harmony, Prospect Hill, Rannoch, St. Pauls, Whalen Corners and Woodham.

The Township is composed predominantly of a mix of rural agricultural land and hamlet residential uses with a total land area of 39,202 hectares. Agricultural uses represent one of the Township's most significant economic and cultural assets.

Perth South is served by the Stratford & District Chamber of Commerce whose mandate is to maintain and improve trade and commerce and to provide the economic, commercial, tourist, agricultural and environmental welfare of the region. Perth South is also a part of the Southwest Economic Alliance: an organization covering much of southwestern Ontario and designed to create partnerships between local government, educational institutions, the broader public sector, and the private sector.

According to the 2011 National Household Survey, the largest economic sectors by number employed are manufacturing (430 workers); agriculture, forestry, fishing and hunting (395 workers); construction (250 workers) and health care and social assistance (180 workers). Other industries employing 100 or more workers include wholesale trade; retail trade; finance and insurance; educational services; and health care and social assistance.

en.wikipedia.org/wiki/Perth_South,_Ontario