6U or 6-U may refer to: Aviation Air Ukraine (IATA code:6U) PW-6U, a model of Politechnika Warszawska PW-6 glider HY-6U, a model of Xian H-6 jet bomber
Other technologies 6U, a rack unit configuration of 10½-inch depth RG-6/U coaxial electrical cable 6U, a model of Zenit Soviet spy satellite
See also U6 (disambiguation)