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The British Aerospace 146 (also BAe 146) is a short-haul and regional airliner that was manufactured in the United Kingdom by British Aerospace, later part of BAE Systems. Production ran from 1983 until 2001. Manufacture by Avro International Aerospace of an improved version known as the Avro RJ began in 1992. A further-improved version with new engines, the Avro RJX, was announced in 1997, but only two prototypes and one production aircraft were built before production ceased in 2001. With 387 aircraft produced, the Avro RJ/BAe 146 is the most successful British civil jet airliner programme.

The BAe 146/Avro RJ is a high-wing cantilever monoplane with a T-tail. It has four turbofan engines mounted on pylons underneath the wings, and has retractable tricycle landing gear. The aircraft has very quiet operation, and has been marketed under the name Whisperjet. It sees wide usage at small, city-based airports such as London City Airport. In its primary role, it serves as a regional jet, short-haul airliner, or regional airliner, while examples of the type are also in use as private jets. The BAe 146/Avro RJ is in wide use with several European-based carriers such as CityJet. The largest operator of the type, Swiss Global Air Lines, retired its last RJ100 in August 2017.

The BAe 146 was produced in -100, -200 and -300 models. The equivalent Avro RJ versions are designated RJ70, RJ85, and RJ100. The freight-carrying version carries the designation "QT" (Quiet Trader), and a convertible passenger-or-freight model is designated as "QC" (Quick Change). A "gravel kit" can be fitted to aircraft to enable operations from rough, unprepared airstrips.