Lieutenant-General Leonidas Polk was a bishop of the Episcopal Diocese of Louisiana and founder of the Protestant Episcopal Church in the Confederate States of America, which separated from the Episcopal Church of the United States of America. He was a planter in Maury County, Tennessee, and a second cousin of President James K. Polk. He resigned his ecclesiastical position to become a major-general in the Confederate States Army, when he was called "Sewanee's Fighting Bishop". His official portrait at the University of the South depicts him as a bishop with his army uniform hanging nearby. He is often erroneously referred to as "Leonidas K. Polk," but he had no middle name and never signed any documents as such.

The Episcopal Diocese of Louisiana is the diocese of the Episcopal Church in the eastern part of the state of Louisiana. The see city is New Orleans.