Guitar Vader (ギターベイダー) was a Japanese underground indie rock band. Formed in 1998, the band is best known for their contributions to the soundtracks of Sega's Jet Set Radio and Jet Set Radio Future games.

Guitar Vader had two lead vocalists and songwriters, guitarist Miki Tanabe and bassist Ujuan Shozo. Miki's childlike voice and Ujuan's tenor are often used in harmony and call and response, but many songs are sung exclusively by one or the other. Their music generally features pop-oriented melodies, often coupled with aggressive power chords and hard rock influences, and sometimes playfully shifts between genres in mid-song. Band members claimed influences like Nirvana, The Beatles, The Pixies and the Ramones, as well as lesser influences like Air and Guitar Wolf. Others have likened their sound to bands as disparate as The B-52's and Smashing Pumpkins.