Cynthia Lee Goyette (born August 13, 1946), also known by her married name Cynthia McCulloch, is an American former competition swimmer, Olympic champion, and former world record-holder. She represented the United States as an 18-year-old at the 1964 Summer Olympics in Tokyo. She won a gold medal for swimming the breaststroke leg for the first-place U.S. team in the women's 4 × 100-metre medley relay. The U.S. relay team set a new world record of 4:33.9 in the event final; Goyette's teammates included Cathy Ferguson (backstroke), Sharon Stouder (butterfly), and Kathy Ellis (freestyle).