Sigma Theta Epsilon (ΣΘΕ) was an interdenominational national Christian fraternal organization whose last active chapter appears to have ceased operations in 2022. Its first name as an emerging national fraternity was Delta Sigma Theta in November 1941, but due to the threat of a lawsuit over that name by a sorority with prior use, in April 1949 the new name, Sigma Theta Epsilon Christian Fraternity, was chosen. Sigma Theta Epsilon traces its history (through a series of name changes and mergers) from Phi Tau Theta (local)'s founding in April 7, 1925 at Lincoln, Nebraska and Sigma Epsilon Theta (local)'s founding on October 8, 1936 at Indiana University.