Radius is a London music ensemble founded in 2007 by the British composer Tim Benjamin.
The ensemble's artistic director is the British composer Ian Vine, a contemporary of Tim Benjamin at the Royal Northern College of Music from 1994 to 1997.
Modelled on the 1960s ensemble The Fires of London, (which in turn was derived from the instrumentation of Schoenberg's Pierrot Lunaire), the core instrumental line-up of Radius is flute, clarinet, violin, cello, piano, and percussion.
To this instrumentation have been added trumpet, trombone, French horn, actors, and vocalists, as required for the performance of specific works.
Although Radius is usually unconducted, the ensemble was conducted by John Traill (musician) for performances of Tim Benjamin's The Corley Conspiracy at London's Southbank Centre in September 2007, directed by Sean Starke.