6V

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