Britain's Lost Masterpieces is a factual BBC Four documentary television series that aims to uncover overlooked art treasures in British public collections, in conjunction with Art UK.

The series also features the art restoration work of Simon Gillespie.

In North American syndication, the series is called The Art Detectives.

[3] Each episode begins with Grosvenor locating a prospective masterpiece in the digitized collection of Art UK.

[4] There was a minor dispute regarding similarities between Britain's Lost Masterpieces and the previous show Grosvenor was on, Fake or Fortune?