The Beechcraft Musketeer is a family of single-engine, low-wing, light aircraft that was produced by Beechcraft. The line includes the Model 19 Musketeer Sport, the Model 23 Musketeer, Custom and Sundowner, the Model 23-24 Musketeer Super III the retractable gear Model 24-R Sierra and the military CT-134 Musketeer.
The Musketeer line was in production from model years 1963 to 1983, during which time a total of 4,366 were produced. The type certificate for the Musketeer family of aircraft has been owned by Hawker Beechcraft since 26 March 2007.
The first of the line was the Model 23. It was introduced under the "Musketeer" name as a 1963 model at an initial price of $13,300 and was powered by a Lycoming O-320-D2B engine of 160 bhp (120 kW). The next year this engine was replaced by the Continental IO-346-A engine of 165 bhp (123 kW). This engine was not a success and was in turn replaced by the Lycoming O-360-A4J engine of 180 bhp (130 kW) starting with the B23 Musketeer Custom of 1968. In 1970 the C23 version was introduced also under the name "Musketeer Custom". In 1972 the C23 was renamed the "Sundowner". When properly equipped, the B23 and C23 are approved for limited aerobatics.