Juliet Maryon Mills, (b 21 November 1941, in London) is an English character actress, most famous for her roles on shows such as Nanny and the Professor and Passions. In both series, she plays characters who possess magical powers; but while her character Phoebe in Nanny was presented as friendly and magical, Tabitha Lenox of Passions is a witch who wishes harm on many people. Her Passions character has since softened, and was proclaimed a "good witch" in the 4 June 2007 episode. Mills also starred in Avanti!, a 1972 film which co-starred Jack Lemmon and was directed by Billy Wilder.

Mills is the daughter of actor Sir John Mills, and playwright Mary Hayley Bell. She is the older sister of actress Hayley Mills and of director Jonathan Mills.

Mills won an Emmy Award for "Outstanding Single Performance by a Supporting Actress in a Comedy or Drama Special" for the miniseries adaptation of QB VII (1974). She had previously received Golden Globe Award nominations in 1971 an