Robert Swire-Thompson (born 5 November 1982) is an Australian record producer, singer, songwriter, and DJ. He is the founder and vocalist of the drum and bass/electronic rock band Pendulum, as well as DJ and co-founder of electro house duo Knife Party formed of Swire and Gareth McGrillen.

Originally from Perth, Western Australia, Swire relocated to the United Kingdom in 2003 with fellow Pendulum co-founders Gareth McGrillen and Paul "El Hornet" Harding. Swire has since fulfilled a broad spectrum of roles as a member of Pendulum, ranging from songwriting to singing while performing live with an unusual guitar-like MIDI controller – Starr Labs' Ztar Z6S-XPA. Swire also plays guitar, bass, keyboards, percussion, and other instruments. He is sometimes referred to by the stage name Anscenic.