Barbara Mullen (9 June 1914 – 9 March 1979[1]) was an American-born actress well known in the United Kingdom for playing the part of Janet McPherson, the housekeeper in Dr. Finlay's Casebook.

She later succeeded Celia Johnson as Mrs. De Winter in Daphne du Maurier's Rebecca, played Maggie in a revival of What Every Woman Knows by J.M.

She also played a notable role in the 1942 film version of Robert Ardrey's Thunder Rock as Ellen Kirby, the feminist who is jailed for her subversive ideas.

She appeared on television in America and Britain in programmes such as Juno and the Paycock and The Danny Thomas Show before being offered the role in Dr. Finlay's Casebook, which began on the BBC in 1962.

Her character, Janet McPherson, was the ever-efficient housekeeper to Doctors Finlay and Cameron at Arden House in the fictional Scottish village of Tannochbrae.