South Kalimantan (Kalimantan Selatan) is a province of Indonesia. It is located in Kalimantan, the Indonesian territory of Borneo. The provincial capital is Banjarmasin. The population of South Kalimantan was recorded at just over 3.625 million people at the 2010 Census, the latest official estimate (for 2017) is 4,119,794.

One of five Indonesian provinces in Kalimantan, it is bordered by the Makassar Strait in the east, Central Kalimantan in the west and north, the Java Sea in the south, and East Kalimantan in the north.