Brian Sergent (born 29 December 1959) is a comedian, writer and actor born and based in Wellington, New Zealand Sergent's acting career began at age 15 playing Lionel in the soap opera, Close to Home. In television Sergent is known for playing Eric Grady on Outrageous Fortune, the New Zealand Prime Minister on Flight of the Conchords, and Harold in The Lost Children.

One of his most popular characters, cabin steward Gavin Soper, appeared on the Pulp Comedy television series. Sergent has a strong association with Circa Theatre in Wellington. He performed in The Duchess of Malfi (1982), Travels with My Aunt (1997) and Take a Chance on Me (2001).