Plus four
Plus four may refer to:

 Plus fours, trousers that extend four inches below the knee
 Commodore 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