Ann Lloyd Keen (née Fox; born 26 November 1948) is a British Labour Party politician, who served as Member of Parliament (MP) for Brentford and Isleworth from 1997, until she was defeated by Conservative candidate Mary Macleod in 2010. In 1999, The Guardian newspaper revealed that she had acted as a "secret go-between" for the Labour Party and Shaun Woodward, at the time the MP for Witney, as he attempted to defect from the Conservative Party in the same year.