The JACK Quartet is an American string quartet dedicated to the performance of contemporary classical music. It was founded in 2005 and is based in New York City. The four founding members are violinists Christopher Otto and Ari Streisfeld, violist John Pickford Richards, and cellist Kevin McFarland. In 2016, violinist Austin Wulliman and cellist Jay Campbell joined the quartet, replacing Streisfeld and McFarland. The quartet met while attending the Eastman School of Music, and they have studied closely with the Kronos Quartet, Arditti Quartet, and Muir String Quartet.