U0

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