Margaret "Margie" Dingeldein (born May 30, 1980) is an American water polo player who won a bronze medal in the 2004 Athens Olympics.

She earned first-team all-tournament at the water polo National Tournament, as well as Academic All-American.

Dingeldein scored a team-high nine goals in the four games at the National Championships, including four in a win over Princeton University.

Dingeldein was a member of the US National Team, winning the gold medal in 2003 at the FINA World Water Polo Championships.

In 2005, Dingeldein joined the women's water polo team coaching staff at the University of Hawaii.