John Patrick Vivian Flynn (born 14 March 1983) is a British actor and singer-songwriter. He has starred as Dylan Witter in the Channel 4 and Netflix television sitcom Lovesick, and portrayed David Bowie in the film Stardust.

Flynn is the lead singer and songwriter of the band Johnny Flynn & The Sussex Wit. He has released six studio albums and two live albums. He has also composed music for stage, screen, and radio.