Irene Worth, CBE (June 23, 1916 – March 10, 2002), born Harriett Elizabeth Abrams, was an American stage and screen actress who became one of the leading stars of the British and American theatre. She pronounced her first name with three syllables: "I-REE-nee".

Worth made her Broadway debut in 1943, joined the Old Vic company in 1951 and the Royal Shakespeare Company in 1962. She won the BAFTA Award for Best British Actress for the 1958 film Orders to Kill. Her other film appearances included Nicholas and Alexandra (1971) and Deathtrap (1982). A three-time Tony Award winner, she won the Tony Award for Best Actress in a Play for Tiny Alice in 1965 and Sweet Bird of Youth in 1976, and won the 1991 Tony Award for Best Featured Actress in a Play for Lost in Yonkers, a role she reprised in the 1993 film version. One of her later stage performances was opposite Paul Scofield in the 2001 production of I Take Your Hand in Mine at the Almeida Theatre in London.