David Fynn is an Irish and British actor, producer and screenwriter. He was born in Cork, Ireland.
Fynn is best known for playing Brett in NBC's sitcom Undateable. His other television appearances include Game of Thrones, Sherlock, Doctor Who, The Inbetweeners, The Job Lot, Banana, Big Bad World, Mayday, Black Mirror, Life's Too Short, Pete versus Life, Peep Show, and Spooks. In January 2021 he appeared as one of the lead characters, journalist Jonathan Hill, in the ITV miniseries The Pembrokeshire Murders. In 2022 he played the part of a journalist in ITV's The Thief, His Wife and the Canoe, and Alex in BBC's Am I Being Unreasonable?.
Fynn received an Evening Standard Theatre Award Nomination for Outstanding Newcomer for his performance in She Stoops to Conquer at the National Theatre in 2012. He also began playing Dewey Finn in the West End cast of Andrew Lloyd Webber's musical School of Rock (based on the 2003 film with Jack Black) in October 2016 at the New London Theatre, for which he received an Olivier Award nomination for Best Actor in a Musical in 2017.