Plus four may refer to:
Plus fours, trousers that extend four inches below the knee Plus/4, a home computer released in 1984 Morgan +4, a sports car produced by the Morgan Motor Company ZIP+4, a United States ZIP code add-on Max Roach + 4, a 1956 album by Max Roach Sonny Rollins Plus 4, a 1956 album by Sonny Rollins