Toronto South was a federal electoral district represented in the House of Commons of Canada from 1904 to 1935.

It was located in the city of Toronto in the province of Ontario.

It initially consisted of the portion of the city of Toronto, including Toronto Island, lying west of the River Don and south of Queen Street.

In 1924, it was redefined to consist of the part of the city of Toronto south of Dundas Street, west of Jarvis Street, and east of Atlantic Avenue and Dovercourt Road, together with Toronto Island.

The electoral district was abolished in 1933 when it was redistributed between Spadina, St. Paul's and Trinity ridings.