Robert J. Mattos (September 28, 1941 – March 14, 2010) was an American football coach.
He served as the head football coach at California State University, Sacramento from 1978 to 1992, compiling a record of 84–73–2.
Prior to coaching at Sacramento State, Mattos was the head football coach at Stagg High School in Stockton, California.
Mattos died of brain cancer March 14, 2010, at his home in Rancho Murieta, California.
This biographical article relating to a college football coach first appointed in the 1970s is a stub.