The Southern Province () is one of the four provinces of Sierra Leone. It covers an area of 20,201 kmò and has a population of 1,438,572 (2015 census). It consists of four districts (Bo, Bonthe, Moyamba, and Pujehun). Its capital and administrative center is Bo, which is also the second largest and second most populated city in Sierra Leone after the nation's capital Freetown. The population of the southern province is largely from the Mende ethnic group.
The province is divided into 4 districts.
Southern Province has the following borders:
To the south and west of Southern Province is the Atlantic Ocean.
Sierra Leone's last remaining stand of rainforest is at Gola.