Mistresses is a British serial drama television programme that follows the lives of four female friends and their involvement in an array of illicit and complex relationships. The programme was written by Rachel Pole, Richard Warlow, Harriet Braun and Catrin Clarke and filmed in Bristol by Ecosse Films for BBC Drama, Wales.

The first series was broadcast on BBC One from 8 January to 12 February 2008 in a six-episode run. A second series of six episodes aired from 17 February to 24 March 2009. Mistresses returned for a third and final series comprising four episodes on 5 August 2010.