Kay Mazzo (born January 17, 1946) is an American former ballet dancer and educator. In 1961, she joined Jerome Robbins' company, Ballets USA. The following year, she joined the New York City Ballet, and was promoted to principal dancer in 1969. She created roles for George Balanchine and Robbins, before retiring from performing in 1981. She then joined the permanent faculty of the School of American Ballet in 1983, named co-chairman of faculty in 1997 and chair of faculty in 2018. She stepped down from the position in June 2022, but continues to teach.