Robert Lafayette Nix (November 8, 1944 – May 20, 2012) was an American drummer best known as a founding member of the rock band Atlanta Rhythm Section (ARS).
Nix grew up in Jacksonville, Florida and graduated from Paxon Senior High School in 1962; also attended Paxon Senior at the same time as Nix was J. R. Cobb, who later became a member of ARS.
Influenced by Joe Morello, Hal Blaine, Cozy Cole and Buddy Rich, in 1964 Nix became a member of Roy Orbison's backing band The Candymen, playing on and off with him for six years. and also played on recordings for artists including The Classics IV, Lynyrd Skynyrd, and Al Kooper.