XJ may refer to: Mesaba Airlines (IATA airline code XJ, 1974-2012) Thai AirAsia X (IATA airline code XJ since 2014) Jaguar XJ, a car series made by Jaguar XJ music, a collaborative instrument for ambient music production Jeep Cherokee (XJ), an internal vehicle code used by Jeep Yamaha XJ650 Maxim, a motorcycle series made by Yamaha Xinjiang, an autonomous region of China (Guobiao abbreviation XJ)