Ruben Guzman is a United States Swimming (USS) coach for age-group swimmers. He has coached swimming for over 35 years at the summer recreational, high school, collegiate, and competitive year-round USS levels.

Over the years, Guzman's teams have won numerous championships, and dozens of his swimmers have gone on to compete at the collegiate level. His athletes have advanced to nationals and Olympic trials. Recognized worldwide as an expert in stroke technique, Guzman served as the stroke specialist for the California Capital Aquatics team and worked closely with retired head coach Mike Hastings, an assistant coach on the 1992 U.S. Olympic team.

In 2008, what was to be his final year of coaching at the high school level, Guzman's swim team at Christian Brothers High School (Sacramento, California) qualified 22 of its 33 swimmers for the state championships. Ever the teacher, in 2016, Guzman came out of retirement to coach his son's high school team. He continues to conduct clinics and trainings for swim teams and coaches.

Guzman holds a bachelor's degree in biological sciences from California Lutheran University and a master's degree in public health from UCLA, specializing in behavioral sciences and health promotion.

In addition to his swimming expertise, Guzman is author of the book Evolving Health and is a professional speaker and consultant specializing in leadership development, communication, health promotion, and productivity for leaders and their organizations.