X-Jet or XJet may refer to:
Williams X-Jet, a single-person lightweight aircraft X-Jet (airline), a defunct Austrian airline X-Jet (comics), or Blackbird, a fictional aircraft in Marvel Comics XJet, a fixed-base operator at London Stansted Airport xjet, a YouTube channel by Bruce Simpson
See also ExpressJet, an American airline Cross-Jet, a Rabasa Cycles model JET-X, Joint European Telescope for X-ray astronomy