Daniel Ivan "Dan" Klatt is a retired American water polo player who competed at the 2004 Summer Olympics, where his team finished in seventh place.
Klatt learned to swim aged 3, from his father, Richard Klatt, an experienced swimming and water polo coach and a former top-level swimmer. He started training in swimming in 1984, but later focused on water polo, only occasionally competing in swimming at the university level. He retired from competitions shortly after the 2004 Olympics to become the head coach of the women's water polo team of the University of California, Irvine. He was also assistant coach with the national women's water polo team in the 2012 & 2016 Olympic Games.
Dan Klatt is entering his 11th season as head coach of the UCI women's water polo team. UCI earned its fourth straight 20-win season in 2014 as well as its fifth Big West regular season title, fifth Big West Tournament title, and third berth into the NCAA Tournament. Klatt earned Big West Coach of the Year honors for the fifth time in 2014 following his ninth consecutive winning season where he tied a program record with 25 wins in 2014 and registering the program's third perfect conference record. The 2014 Anteaters finished sixth in the NCAA Tournament and finished ranked sixth in the national poll, tying its highest mark. The squad spent four weeks at No. 5, the team's highest national ranking. Klatt also serves as an assistant coach with the U.S. Women's National Team and was recently appointed the head coach of the U.S. junior national team. He guided the team to its first ever Gold Medal in the London Olympic Games in 2012. He has also led them to titles in both the FINA Women's World Cup and the FINA World League Super Finals eliminating Australia both times. Klatt was a member of the 2004 U.S. Olympic Water Polo team that competed in the Athens Games. He's been a member of the national team since graduating from UCI in 2001 where he played his college water polo career.