Robert Adrian Catley is an English singer. He was the lead singer of the hard rock band Magnum and is also active as a solo artist.

Magnum were an English progressive rock, melodic hard rock and AOR band. They were formed in Birmingham in 1972 by Tony Clarkin and Bob Catley (vocals) in order to appear as the resident band at the Rum Runner nightclub in the city. Magnum have undergone several changes in personnel over the years; however, the core of Catley and Clarkin remained until Clarkin's death in 2024.