|Women's water polo|
|Competitor for the United States|
|Gold||2012 London||Team competition|
|Silver||2008 Beijing||Team competition|
|Gold||2007 Melbourne||Team competition|
|Gold||2009 Rome||Team competition|
|FINA Water Polo World League|
|Gold||2006 Cosenza||Team competition|
|Gold||2007 Montreal||Team competition|
|Pan American Games|
|Gold||2007 Rio de Janeiro||Team competition|
Elizabeth ("Betsey") Armstrong (born January 31, 1983 in Ann Arbor, Michigan) is a female water polo goalkeeper from the United States, who won the gold medal with the United States women's national water polo team at the 2007 Pan American Games and 2012 Summer Olympics. Armstrong attended Huron High School in Ann Arbor and was a three-year letterwinner on her water polo team.  She then went on to graduate from the University of Michigan in 2005, where she was the goalkeeper for the women's water polo team. Betsey graduated with a bachelor's degree in English language and Literature.  She is currently the record holder at University of Michigan with 350 saves. 
Armstrong made her debut for the national team in 2006. At the 2008 China Summer Olympic games, she and the American team lost 8-9 in the championship game to the Netherlands and took home the silver medal.
In June 2009, Armstrong was named to the USA water polo women's senior national team for the 2009 FINA World Championships. She was named the best female water polo player for 2010 by FINA Aquatics World Magazine.
Starting in 2012, Betsey was hired as the assistant coach of the University of Michigan Women's Water Polo Team. She works alongside head coach Matt Anderson in coaching the players.
- 2000 — Junior Pan American Games, Barquisimeto, Venezuela, 1st place
- 2006 — FINA World League, Cosenza, Italy, 1st place
- 2006 — FINA World Cup, Tianjin, China, 4th place
- 2006 — Holiday Cup, Los Alamitos, United States, 1st place
- 2007 — FINA World Championships, Melbourne, Australia, 1st place
- 2007 — FINA World League, Montréal, Canada, 1st place
- 2007 — Pan American Games, Rio de Janeiro, Brazil, 1st place
- 2008 — Summer Olympic Games, Beijing, China, silver medal
- 2011 — Pan American Games, gold medal
- 2012 — Summer Olympic Games, London, gold medal
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- "US women win 1st gold in Olympic water polo". The Times Of India. Retrieved 10-08-2012. Check date values in:
- "Betsey Armstrong". Retrieved 7 February 2013.
- "Betsey Armstrong".
- "Betsey Armstrong".
- Roster Announced For 2009 FINA Women's World Championships, June 24, 2009.
- "FINA Elects the Best in 2010". Fédération Internationale de Natation. Archived from the original on 2011-02-02. Retrieved 2011-02-02.
- "Olympic Gold Medalist Betsey Armstrong Joins University of Michigan Coaching Staff".
|FINA Water Polo Player of the Year