Pauline Collins is a British actress who first came to prominence portraying Sarah Moffat in Upstairs, Downstairs (1971–1973) and its spin-off Thomas & Sarah (1979). In 1992, she published her autobiography Letter to Louise.

Sarah Moffat, also known as Sarah Delice and Clémence Dumas, is a fictional character in the ITV drama Upstairs, Downstairs and its spin-off Thomas & Sarah. She was portrayed by Pauline Collins.