Dame Katherine Patricia Routledge, (; born 17 February 1929) is an English actress and singer. She is best known for her role as Hyacinth Bucket in the BBC sitcom Keeping Up Appearances (1990–95), for which she was nominated for the BAFTA TV Award for Best Light Entertainment Performance in 1992 and 1993. Her film appearances include To Sir, with Love (1967) and Don't Raise the Bridge, Lower the River (1968).

Routledge made her professional stage debut at the Liverpool Playhouse in 1952 and her Broadway debut in How's the World Treating You in 1966. She won the 1968 Tony Award for Best Actress in a Musical for her role in Darling of the Day, and the 1988 Olivier Award for Best Actress in a Musical for Candide.

On television, she came to prominence during the 1980s in monologues written by Alan Bennett and Victoria Wood; appearing in Bennett's A Woman of No Importance (1982), as Kitty in Victoria Wood as Seen on TV (1985–86), and being nominated for the BAFTA TV Award for Best Actress for Bennett's Talking Heads: A Lady of Letters (1988). She also starred as Hetty Wainthropp in the British television series Hetty Wainthropp Investigates (1996–98).