Mike Van Diest is an American football coach. He is the defensive coordinator at Montana State University–Northern, a position he has held since 2021. Van Diest served as the head football coach at Carroll College in Helena, Montana from 1999 to 2018, compiling record of 203–54. Van Diest's Carroll Fighting Saints won six NAIA National Championships, four consecutively from 2002 to 2005, a fifth in 2007, and a sixth in 2010.