Casey A. Royer (born October 8, 1958), is an American musician and an early pioneer of the hardcore punk rock genre in Orange County. In a career spanning more than 40 years, Royer is best known as the lead vocalist for Southern Californian punk rock band D.I. and as a drummer for the Adolescents.
As a teenager, he formed Social Distortion with Mike Ness, within which he was the drummer.
