Robert Vaughan Moody, OC FRSC (/ˈmuːdi/; born November 28, 1941) is a Canadian mathematician.

"Almost simultaneously in 1967, Victor Kac in the USSR and Robert Moody in Canada developed what was to become Kac–Moody algebra.

Kac and Moody noticed that if Wilhelm Killing's conditions were relaxed, it was still possible to associate to the Cartan matrix a Lie algebra which, necessarily, would be infinite dimensional."

In 1966, he joined the Department of Mathematics as an assistant professor in the University of Saskatchewan.

In 1989, he joined the University of Alberta as a professor in the Department of Mathematics.