Vitamin String Quartet (VSQ) is a musical group from Los Angeles, California that is widely known for its series of tribute albums to rock and pop acts. Their albums are released through Vitamin Records and primarily performed by a string quartet, though other instruments have been used. "Vitamin String Quartet is about applying rock n' roll attitude to classical technique," says Tom Tally, a violist and arranger who has performed on and produced over fifty Vitamin String Quartet albums.

Their albums honor a wide variety of genres, including pop and rock, metal, techno, country, and hip-hop, and a wide variety of groups, such as Queen, Led Zeppelin, Michael Jackson, The Beatles, Black Sabbath, Iron Maiden, Bruce Springsteen, Jimi Hendrix, The Smashing Pumpkins, Radiohead, System of a Down, The Killers, Red Hot Chili Peppers, Coldplay, Muse, Thirty Seconds to Mars, Slayer, Adele, Lady Gaga and many more. Their discography includes 261 albums.