Kambia District is a district in the North West Province of Sierra Leone. Its capital and largest city is the town of Kambia. As of the 2015 census, The District had a population of 343,686. Kambia District borders the Republic of Guinea to the north, Port Loko District to the south and Karene District to the east. The district provides an important Trade route to or from the Sierra Leonean capital Freetown to the Guinean capital Conakry.
The district occupies a total area of 3,108 km2 (1,200 sq mi) and is divided into seven chiefdoms.
Kambia district is overwhelmingly Muslim majority. The population of the district is ethnically diverse. Kambia District is home to the largest population of ethnic Susu in Sierra Leone. Most of the Susu people in Sierra Leone live in Kambia District. The Susu along with the Temne form one of the largest ethnic groups in the district.