Otis Verries Hicks, known as Lightnin' Slim (March 13, 1913 – July 27, 1974), was an American blues musician who played Louisiana blues and swamp blues for Excello Records. The blues critic ED Denson ranked him as one of the five great bluesmen of the 1950s, along with Muddy Waters, Little Walter, Howlin' Wolf and Sonny Boy Williamson.