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Siobhan Finneran (born Siobhan Margaret Finneran on 26 April, 1966; Oldham, Lancashire, England) is the actress who played Sarah O'Brien on Downton Abbey.

Finneran's first major role was in the 1986 film, Rita, Sue and Bob Too. She is also known for her roles in ITV's comedy drama Benidorm and in the BBC's drama series The Syndicate.