Siobhan Margaret Finneran is an English television and film actress. She made her screen debut in the 1987 independent film Rita, Sue and Bob Too, and subsequently worked consistently in television drama including roles in Coronation Street (1989–1990), Clocking Off (2000–2002) and The Amazing Mrs Pritchard (2006).

In 2005, Finneran originated the lead female role in the stage play On the Shore of the Wide World and was awarded the Manchester Evening News Theatre Award for Best Actress in a Leading Role. Also a comedy performer, Finneran appeared as Janice Garvey, a leading character in the first seven series of ITV sitcom Benidorm (2007–2015). Later television roles include portraying a lawyer in the mini-series Unforgiven (2009), an embittered servant in the first three series of the costume drama Downton Abbey (2010–2012) and a recovering addict in Happy Valley (2014–2023), for which she was nominated for the 2017 British Academy Television Award for Best Supporting Actress.