6V or 6-V may refer to:
6V, IATA code for Mars RK airlines 6v, abbreviations for 6 volts 6V, abbreviation for 6-valve engine 6V-71, engine used in Detroit Diesel Series 71 6V-92, engine used in Detroit Diesel Series 92 6V, the production code for the 1985 Doctor Who serial Vengeance on Varos
See also V6 (disambiguation) VVVVVV, 2010 puzzle-platform game by Terry Cavanagh