Cynthia Lee Woodhead (born February 7, 1964), commonly known by her family nickname "Sippy", is an American former competition swimmer, world champion, Olympic medalist, and former world record-holder. She won three gold medals at the 1978 World Championships, when she was only 14 years old, and set seven world records during her career.
Woodhead received gold medals in the 200-meter freestyle, 4×100-meter freestyle and medley relay, and two silver medals at the 1978 World Championships in Berlin, when she was only 14 years old.
At the 1979 Pan American Games in San Juan, Puerto Rico, she received five gold medals. She won the 100-, 200-, and 400-meter freestyle, as well as being part of the winning U.S. teams in the 4×100-meter freestyle and 4×100-meter medley relays.
Woodhead had qualified for six events at the 1980 Summer Olympics in Moscow, and was regarded to be among the favorites in the four individual distances, as she was ranked world number one in 100-, 200-, 400-, and 800-meter freestyle. Due to the American boycott of the Moscow Olympics however, she did not get the chance to participate. This was a great disappointment for her, and she has said that the boycott may have triggered her later health problems.
She broke the long course 50-meter freestyle world record, April 10, 1980, but the record was further improved by Jill Sterkel the same day. She also broke the long course 200-meter freestyle world record, three times, in 1978 and 1979, her last result remained a world record until 1984. She was also a member of the U.S. team that held the 4×100-meter freestyle relay world record from 1978 to 1980.