3V or 3-V may refer to:

TNT Airways S.A.'s IATA code 3V, a model of Toyota V engine SSH 3V (WA); se Washington State Route 241 S281-3V, a model of Saleen S281 3V (V-70), manufacturer's designation for Venera 7 3V (V-72), manufacturer's designation for Venera 8

See also V3 (disambiguation)