Ann Jellicoe (born 15 July 1927) is a British actor, theatre director and playwright. Although her work has covered many areas of theatre and film, she is best known for "pushing the envelope" of the stage play, devising new forms which challenge and delight unconventional audiences. As a result her dramatic career is, in many ways, unique in the twentieth century.

Jellicoe was born in Middlesbrough, Yorkshire in England in 1927 and from childhood showed an interest and an aptitude for the theatre. She attended Polam Hall School and Queen Margaret's School, York and studied performing arts at the Central School of Speech and Drama. This was followed by experience in repertory and fringe theatre.

In 1949 she was commissioned to undertake an investigative study into the relationship between acting and theatre architecture; the finding of this study led her to the Open stage. Jellicoe established a Sunday Theatre Club (Cockpit Theatre Club) where she produced and directed a number of plays exploring the possibilities of this form of Open stage theatre, including a one-act of her own.