Christopher O'Dowd (born 9 October 1979) is an acclaimed Irish actor and comedian widley recognized for his role as Roy Trenneman in the Channel 4 comedy The IT Crowd. His career spans television, film, and theatre, demonstrating his versatile acting talent. He further established himself in the industry by starring in popular films like Gulliver's Travels, Bridesmaids, Friends with Kids, Cuban Fury, Miss Peregrine's Home for Peculiar Children, and The Cloverfield Paradox. O'Dowd also donned the hat of a creator for the Sky 1 television series Moone Boy, receiving Irish Film and Television Award nominations for his multifaceted contributions in acting, writing, and directing.

Since 2017, O'Dowd has starred as Miles Daly in the Epix comedy series Get Shorty. He also had a recurring role on the critically-loved comedy-drama series Girls, where his performance earned him a Primetime Emmy Award. His Broadway debut was in the play adaptation of Of Mice and Men in 2014, where he received a Tony Award nomination. In 2020, his contributions to Irish cinema were further accoladed when he was ranked #39 on The Irish Times list of Ireland's greatest film actors. Despite his success, O'Dowd has remained connected to his roots, still finding time to co-write a series called Moone Boy based on his childhood, filmed in his hometown of Boyle.