Ellen Marie Estes (born October 13, 1978) is an American water polo player, who won the silver medal at the 2000 Summer Olympics. She also won a bronze medal at the 2004 Summer Olympics. Estes scored three goals during the bronze medal game against Australia.

Estes played for Stanford University. She was a senior on the 2002 NCAA National Championship Team; was a two-time All-American; and broke a Stanford scoring record with 93 goals in her sophomore year. She graduated with an Engineering degree at Stanford, and interned for studied roller-coaster design as an intern with Disney.

In 2003, Estes was named the USA Water Polo Female Athlete of the Year.

From 2007–2009, Estes served as a volunteer assistant coach for the Harvard University Men's and Women's Water Polo Teams, while finishing her MBA at Harvard Business School.

In 2012, she was inducted into the USA Water Polo Hall of Fame.^[1][2]

• Olympic Games: Silver Medal (2000), Bronze Medal (2004)
• World Championships: Gold Medal (2003)
• Pan American Games: Second Place (1999)
• FINA World Cup: Second Place (2002)

• United States women's Olympic water polo team records and statistics
• List of Olympic medalists in water polo (women)
• List of world champions in women's water polo
• List of World Aquatics Championships medalists in water polo

• Ellen Estes at World Aquatics
• Ellen Estes at the USA Water Polo Hall of Fame
• Ellen Estes at Olympics.com
• Ellen Estes at Olympedia