Mongrels is a British puppet-based musical situation comedy series first broadcast on BBC Three between 22 June and 10 August 2010, with a making-of documentary entitled "Mongrels Uncovered" broadcast on 11 August 2010. A second and final series of Mongrels began airing on 7 November 2011.

The series revolves around the lives of five anthropomorphic animals who hang around the back of a pub in Millwall, the Isle of Dogs, London. The characters are Nelson, a metrosexual fox (voiced by Rufus Jones, performed by Andy Heath); Destiny, an Afghan hound (voiced by Lucy Montgomery, performed by Richard Coombs and Sue Beattie); Marion, a "borderline-retarded" cat (voiced by Dan Tetsell, performed by Warrick Brownlow-Pike); Kali, a grudge-bearing pigeon (voiced by Katy Brand, performed by Iestyn Evans); and Vince, a sociopathic foul-mouthed fox (voiced by Paul Kaye, performed by various puppeteers).

The show is aimed at an adult audience, features "neutering, incontinence, cannibalism and catnip overdoses" and has several humour styles such as slapstick and farce. For example, the first episode begins with a scene in which Marion, portrayed as desperately trying to revive his deceased owner, learns she has actually been dead for four months, whereupon he casually gives his cat friends permission to eat her. Mongrels has attracted accusations of plagiarism, with claims that Mongrels stole ideas from a similar Channel 4 show called Pets.

On January 18, 2012, it was announced via Twitter that Mongrels had not been renewed for a third series by the BBC due to a decision made by BBC Three's then controller Zai Bennett.