Bret Peter Tarrant McKenzie (born 29 June 1976 in Wellington, New Zealand) is a comedian, actor, musician and producer, best known for being one half of the musical comedy duo Flight of the Conchords along with Jemaine Clement. In the 2000s, the duo's comedy and music became the basis of a BBC radio series and then an oft-lauded American television series, which aired for two seasons on HBO. Active since 1998, the duo released their most recent comedy special, Live in London, in 2018.

Primarily a musician, McKenzie has worked as a songwriter and music supervisor for film and television since the 2010s. He served as music supervisor for two Muppet films, The Muppets (2011) and Muppets Most Wanted (2014), the former of which won him an Academy Award for Best Original Song for the song "Man or Muppet". In the 2000s, McKenzie was part of reggae fusion band The Black Seeds and Wellington International Ukulele Orchestra, and, in the 2010s, he began performing solo material. His debut album Songs Without Jokes was released in August 2022.