Charles Erasmus Fenner (February 14, 1834 – October 24, 1911) was a Louisiana lawyer who captained a battery in the American Civil War, and later served as a justice of the Louisiana Supreme Court from April 5, 1880, to September 1, 1893. During his service on the court, he hosted a dying Jefferson Davis in his home, and wrote the infamous decision in Plessy v. Ferguson holding that "separate but equal" accommodations could be provided for whites and non-whites, which was upheld by the United States Supreme Court.