4V or 4-V may refer to:
4V, abbreviation for 4 volts 4V, abbreviation for 4-valve engine 4V, IATA code for Birdy Airlines Venera 4V-2 spacecraft Sun-4v, a model of Sun-4 workstation 6AL-4V, a type of titanium alloy 4V, a model of Toyota V engine 4V, abbreviation for QuatroV - TV Show 4V, the production code for the 1977 Doctor Who serial Horror of Fang Rock 4V: an ITU prefix for Haiti
See also V4 (disambiguation)