Ruth Margaret Cadbury (born 14 May 1959) is a British Labour Party politician who has been Member of Parliament (MP) for Brentford and Isleworth since gaining the seat from the Conservatives at the 2015 general election.
Cadbury has been a Brentford councillor for 25 years, and was deputy leader of the Hounslow London Borough Council from 2010–2012 where she was known for her work on a Living Wage for its staff as well as her opposition to any expansion to the nearby London Heathrow Airport.