David Harewood MBE is a British actor and presenter. He is best known for his roles as CIA Counterterrorism Director David Estes in Homeland (2011–2012), and as J'onn J'onzz / Martian Manhunter and Hank Henshaw / Cyborg Superman in Supergirl (2015–2021).

Harewood began acting in 1990 and has appeared in The Hawk, Great Moments in Aviation, Harnessing Peacocks, Mad Dogs and Englishmen, Blood Diamond, The Merchant of Venice and Strings. He is known for his television appearances on Ballykissangel, The Vice and Fat Friends. He played Don Coleman in Hustle (Series 7 The Fall of Railton FC (2011)). In 1997, he was the first black actor to play Othello at the National Theatre in London.

In 2008, he played Major Simon Brooks in The Palace; he also appeared (that December) on Celebrity Mastermind, with specialist subject Philip Pullman's His Dark Materials – and he appeared in the BBC film adaptation of the Philip Pullman novels The Ruby in the Smoke and The Shadow in the North, both of which are titles from the Sally Lockhart Mysteries.

In 2009, Harewood appeared in the BBC single drama Mrs Mandela, playing Nelson Mandela. He played Brother Tuck in the third series of Robin Hood. He appeared in the Doctor Who story "The End of Time". He played Martin Luther King Jr. in the premiere of The Mountaintop, written by American playwright Katori Hall, directed by James Dacre, which opened at Theatre503 in London on 9 June 2009.

Harewood next appeared in two episodes of Chris Ryan's Strike Back as Colonel Tshuma. From June to September 2010, he played Theseus in the premiere of Moira Buffini's play Welcome to Thebes at the National Theatre in London. He played Martin Viner in an episode of New Tricks. He narrates Welcome to Lagos, a BBC documentary about Lagos, Nigeria. He also starred in British independent film The Hot Potato, the film also starred Ray Winstone, Colm Meaney and Jack Huston. He played Frankenstein's monster in the TV live event Frankenstein's Wedding.

From 2011, Harewood starred as David Estes, the director of the CIA's Counterterrorism Center, in the Showtime series Homeland. After appearing in 24 episodes, his character was killed off in a bomb explosion at the end of season 2. Also in 2011, he voiced Captain Quinton Cole in the video game Battlefield 3.

In the 2012 New Year Honours, Harewood was appointed Member of the Order of the British Empire (MBE) for services to drama. In May 2012, he presented a Party Election Broadcast for the British Labour Party.

In October 2013, Harewood voiced an interactive video campaign for the British Lung Foundation aiming to ban smoking in cars with children on board in the United Kingdom. In June 2014, he appeared in Tulip Fever.

In October 2015, he appeared as a core cast member on the CBS television series Supergirl as Hank Henshaw. Since his character was revealed (in the episode Human for a Day) to be J'onn J'onzz/Martian Manhunter posing as Henshaw, he portrays J'onn J'onzz with Henshaw's likeness as his human form and has a dual recurring role as the real Hank Henshaw / Cyborg Superman.

Harewood was included in the 2019 edition of the Powerlist, ranking the 100 most influential Black Britons.  Also in 2019, he played the position of goalkeeper for England in Soccer Aid for UNICEF 2019. Pyschosis and Me, a documentary hosted and produced by Harewood received a BAFTA Television Award nominated for Single Documentary.

In October 2021, it was revealed that Harewood will make his feature directorial debut with For Whom The Bell Tolls, a boxing film about the rivalry between Chris Eubank and Nigel Benn.

Harewood was included in the 2019 edition of the Powerlist, ranking the 100 most influential Black Britons. Also in 2019, he played the position of goalkeeper for England in Soccer Aid for UNICEF 2019. Pyschosis and Me, a documentary hosted and produced by Harewood received a BAFTA Television Award nominated for Single Documentary.

In 2021, The Guardian published an article centering on Harewood and actor Ricardo P Lloyd comparing both of their lives and careers and the struggles black British actors face in the UK. This was part of Black British culture matters, curated by Lenny Henry & Marcus Ryder for The Guardian Saturday Culture Issue No7.

Harewood is a mental health ambassador and has been open about his own struggles, confessing that he used to self-medicate with alcohol in order to deal with his manic depressive and bipolar-like symptoms, discarding the medication given to him by doctors. He was sectioned under the Mental Health Act, spent time on the Whittington Hospital psychiatric ward, and was prescribed the antipsychotic drug chlorpromazine. He subsequently expanded on his experiences, hosting a 2019 BBC documentary titled David Harewood: My Psychosis and Me.

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