A semi-acoustic guitar, also known as a hollow-body electric guitar, is a type of electric guitar designed to be played with a guitar amplifier featuring a fully or partly hollow body and at least one electromagnetic pickup. First created in the 1930s, they became popular in jazz and blues, where they remain widely used, and the early period of rock & roll, though they were later largely supplanted by solid-body electric guitars in rock.

They differ from an acoustic-electric guitar, which is an acoustic guitar that has been fitted with some means of amplification to increase volume without changing the instrument's tone.