Elizabeth Anne "Betsey" Armstrong (born January 31, 1983) is an American water polo goalkeeper, who won gold medals with the United States women's national water polo team at the 2012 Summer Olympics, 2007 and 2011 Pan American Games, and 2007 and 2009 world championships.

Armstrong attended Huron High School in Ann Arbor and was a three-year letterwinner on her water polo team.

At the Beijing 2008 Summer Olympics, they lost 8–9 in the championship game to the Netherlands and took home the silver medal.

[4] In June 2009, Armstrong was named to the USA water polo women's senior national team for the 2009 FINA World Championships.

[6] Starting in 2012, Betsey was hired as the assistant coach of the University of Michigan Women's Water Polo Team.