The Fitzwilliam Quartet is a string quartet currently consisting of Lucy Russell and Marcus Barcham-Stevens, violins; Alan George, viola; and Heather Tuach, violoncello.

Founded in 1968 by four Cambridge undergraduates, the Fitzwilliam Quartet was one of the first of a long line of quartets to have emerged under the guidance of Sidney Griller at the Royal Academy of Music. They became well known through their close personal association with Dmitri Shostakovich, who befriended them following a visit to York to hear them play. He entrusted them with the Western premières of his last three quartets, and before long they had become the first group to perform and record all fifteen. These recordings gained international awards, and secured for the quartet a worldwide concert schedule and a long term contract with Decca/London.