Kate Marie Ziegler (born June 27, 1988) is an American competition swimmer who specializes in freestyle and long-distance events.
Ziegler has won a total of fifteen medals in major international competition, including eight golds, five silvers, and two bronze spanning the World Aquatics and the Pan Pacific Championships. She was a member of the 2012 United States Olympic Team, and competed in the 800-meter freestyle event at the 2012 Summer Olympics.