Dan O'Brien is an American college baseball coach, currently serving as head coach of the Santa Clara Broncos baseball team. He was named to that position prior to the 2012 season. O'Brien played at UC San Diego, led the team in home runs, continues to rank highly on several career lists. In his first year, he helped the team to a third place finish in the NCAA Division III Baseball Championship. He then served as a player/coach for one season with the Greenville Bluesmen under Lyle Yates, and returned to the Tritons the following season as a full-time assistant. After two years, he was elevated to the top job. After three seasons, the Tritons moved the program to Division II, joining the California Collegiate Athletic Association. O'Brien helped establish the Tritons as a strong program in the CCAA, leading them to the College World Series in consecutive years, finishing third and second in 2009 and 2010, respectively. He took over a struggling Santa Clara program in 2012, and has sought to rebuild it in his first two seasons.