| Bob Mattos | |
| Birth Date: | 28 September 1941 |
| Birth Place: | Ceres, California, U.S. |
| Death Place: | Rancho Murieta, California, U.S. |
| Player Years1: | 1962–1963 |
| Player Team1: | Sacramento State |
| Coach Years1: | 1971–1977 |
| Coach Team1: | Stagg HS (CA) |
| Coach Years2: | 1978–1992 |
| Coach Team2: | Sacramento State |
| Overall Record: | 84–73–2 (college) |
| Tournament Record: | 2–1 (NCAA D-II playoffs) |
| Championships: | 2 WFC (1986) |
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. He is the only coach in the school's history to have a winning record. 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.[1] [2]