James Clyde Dietz (July 31, 1938 – March 27, 2022) was an American former baseball player and coach.

He served as the head baseball coach at San Diego State University from 1972 to 2002, compiling a record of 1,230–751–18.

[1] Under Dietz, the Aztecs went to the NCAA Tournament eight times (1979, 1981, 1982, 1983, 1984, 1986, 1990, 1991) while winning the Western Athletic Conference five times (three regular season, two tournaments) and the Mountain West twice (one regular season, one conference).

In the fall of 2001, Dietz announced his retirement from coaching at SDSU, and was replaced by Aztec alum and baseball Hall Of Famer Tony Gwynn following the 2002 season.

[3] Dietz died on March 27, 2022, in Florence, Oregon, from complications from Alzheimer's disease and dementia.