Otis Verries Hicks, known as Lightnin' Slim (March 13, 1913 – July 27, 1974), was an American Louisiana blues musician, who recorded for Excello Records and played in a style similar to its other Louisiana artists. 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.