Bowed guitar is a method of playing a guitar, acoustic or electric, in which the guitarist uses a bow, rather than the more common plectrum, to vibrate the instruments' strings, similar to playing a viola da gamba. Unlike traditionally bowed instruments such as violins, the guitar generally has a relatively flat bridge radius and closely positioned strings, making it difficult to bow individual notes on the middle strings. The technique is often associated with Jimmy Page of Led Zeppelin and the Yardbirds, as well as Jónsi of Sigur Rós. Eddie Phillips of the British group the Creation was one of the first rock guitarists to use a bow in their 1966 song "Making Time".

In music, a bow is a tensioned stick which has hair coated in rosin affixed to it. It is moved across some part of a musical instrument to cause vibration, which the instrument emits as sound. The vast majority of bows are used with string instruments, such as the violin, viola, cello, and bass, although some bows are used with musical saws and other bowed idiophones.