The Fender Mustang is a solid body electric guitar produced by the Fender Musical Instruments Corporation. It was introduced in 1964 as the basis of a major redesign of Fender's student models, the Musicmaster and Duo-Sonic. It was produced until 1982 and reissued in 1990.

In the 1990s, the Mustang attained cult status largely as a result of its use by a number of alternative rock bands, in particular grunge bands, most notably played by Nirvana frontman Kurt Cobain.

The Mustang features two single-coil pickups, an unusual pickup switching configuration, and a unique vibrato system. It was originally available in two scale lengths: 24 inches (609.6 mm) and 22.5 inches (571.5 mm).