Carolyn Lynne Steinseifer (born February 12, 1968) is an American former competition swimmer and Olympic champion. She won gold medals in the women's 100-meter freestyle and 4x100-meter freestyle relay at the 1984 Summer Olympics in Los Angeles, California.
As a 15-year-old at the 1983 Pan American Games in Caracas, Venezuela, she won gold medals in the 4x100-meter freestyle and 4x100-meter medley relays. As a 17-year-old, she won gold medals in the 200-meter freestyle, 4x100-meter freestyle relay and the 4x200-meter relay, and a silver in the 100-meter freestyle at the 1985 Pan Pacific Swimming Championships in Tokyo, Japan.
Steinseifer attended the University of Texas at Austin, where she swam for coach Richard Quick's Texas Longhorns swimming and diving team in National Collegiate Athletic Association (NCAA) competition. During her college career, she was a member of three of the Lady Longhorns' NCAA national championship relay teams—once in the 800-yard relay (1987) and twice in the 200-yard relay (1987, 1988). She was also a key points contributors to the Longhorns' NCAA national team championships in 1987 and 1988.
While attending Texas, she continued to represent the United States in international competition. She won a gold medal in the 4x100-meter freestyle relay at 1987 Pan American Games in Indianapolis, Indiana, and another gold as a member of the winning U.S. team in the 4x100-meter freestyle relay at the 1989 Pan Pacific Swimming Championships in Tokyo.