St. John's South is a defunct provincial electoral district for the House of Assembly of Newfoundland and Labrador, Canada.

As of its final contest in 2011, there were 7,923 eligible voters living within the district.

[1] The riding was created prior to the 1956 election out of parts of St. John's West and Ferryland.

Historically working class in nature, St. John's South includes increasingly prosperous residential pockets.

The district covers the traditional "west end" of St. John's (now geographically closer to the centre, due to city expansion), the western section of the downtown core and the south side of the harbour to Cape Spear, including the neighbourhood of Shea Heights.