(b Chicago, 17 Jan. 1946)
US dancer. She studied with Bernardene Hayes and at the School of American Ballet (from 1959). She made her debut with Robbins's Ballets USA in 1961, appearing in his Afternoon of a Faun in Paris. The following year she joined New York City Ballet, becoming a soloist in 1965 and a principal in 1969. When Suzanne Farrell left NYCB in 1969, Mazzo, who bore a strong resemblance to her, inherited many of her roles. She was a dancer possessed of considerable beauty and technique, who also suggested an appealing vulnerability. She created roles in several Balanchine ballets, including Suite No. 3 (1970), Violin Concerto, Duo concertant (both 1972), Union Jack (1976), Vienna Waltzes (1977), and Davidsbündlertänze (1980). She also created roles in Robbins's Dances at a Gathering (1969) and In the Night (1970). Following her retirement from the company she taught at the School of American Ballet (from 1983) becoming co-chair of the faculty in 1997.