Margaret Ollerenshaw (born 8 October 1949) is an English actress. She is known for portraying the role of Mavis in the BBC sitcom Open All Hours (1981–1982) and its sequel Still Open All Hours (2013–2019). Her other television credits include First of the Summer Wine (1988–1989), The House of Eliott (1992) and Lovejoy (1993–1994).