U0 may refer to:
Ultra Air (former IATA code: U0), a former Colombian low-cost airline N53B30-U0, a 3.0-litre model of the BMW N53 engine released in September 2007 Oberursel U.0, an engine equipping the 1915 German Fokker E.II fighter aircraft Vacuum permeability (μ0), a constant in physics
See also 0U (disambiguation)