The Allegri Quartet was a British string quartet formed in 1953 in the United Kingdom. The group was established by the violinist Eli Goren. The original members included James Barton, Patrick Ireland, and William Pleeth. The ensemble was Britain's longest-running chamber music group. Since 1964, they performed more than 60 world premières, including commissioned works by James MacMillan, Jonathan Harvey, and Colin Matthews. In their early years, the quartet performed at the Victoria and Albert Museum and collaborated with Yehudi Menuhin and Hephzibah Menuhin. Their recordings include Berg: Lyric Suite (2001), which received critical recognition for its clarity. The group performed at Wigmore Hall in 2004 for their 50th anniversary. The quartet became inactive in 2023. Following the disbandment, second violinist Rafael Todes formed a new ensemble under the name New Allegri.