The Biggest Loser was a British reality television show that began airing on Living TV from 2005 to 2006, before moving to ITV in 2009 and finished in 2012. Most recently hosted by Davina McCall, the show is a spin-off of the American reality television show of the same name. The show originally featured Angie Dowds and Mark Bailey as the personal trainers, with Richard Callender replacing Bailey from series 3. After Dowds' death, she was replaced by Charlotte Ord and Rob "The Killer" Edmond for the fifth series. at Beachy Head. The first two series of the show were hosted by Vicki Butler-Henderson on Living TV, the third series was hosted by Kate Garraway and Davina McCall began presenting the show in its fourth series on ITV. In September 2012, it was announced that the show would be cancelled, with no further series planned.

The Biggest Loser (UK) (2005) is currently not available on any services.