The Gisu people, or Bagisu (people of Bugisu sub-region), alternately Gishu, Masaba, or Sokwia, are a tribe of the Masaba nation of eastern Uganda, closely related to the Bukusu people of Kenya. Bagisu live mainly in the Mbale District of Uganda on the slopes of Mount Elgon.
The Gisu speak a dialect of the Lumasaba language called Lugisu, which is fully understandable by other dialects, and is also understood by the Bukusu.
The Gisu undergo a circumcision ritual called the Imbalu. The ritual is held every two years during August.