Glynnis O'Connor (born November 19, 1956) is an American actress of television, film, radio, and theater. She first gained wide attention in the mid-1970s with leading roles in the television version of Our Town and in the short-lived series Sons and Daughters. She also co-starred with Robby Benson in the films Jeremy in 1973 and Ode to Billy Joe in 1976, as well as with Jan-Michael Vincent in the film Baby Blue Marine in 1976.
O'Connor was born in New Rochelle, New York, and is the daughter of actress Lenka Peterson and film producer Daniel Patrick O'Connor. She is married to Douglas Stern, a New York City native, and they have two daughters together, Lindsay (b. 1990) and Hana.
In 1973, O'Connor sang the title song for the film Jeremy in which she also co-starred with Robby Benson. On January 8, 1974, she starred in the CBS Radio Mystery Theatre production of "Ring of Roses" and then co-starred with John Travolta in the 1976 made-for-television movie The Boy in the Plastic Bubble. That same year she portrayed the character Bobbie Lee Hartley, co-starring once again with Robby Benson, in the film Ode to Billy Joe, a tragic romance produced and directed by Max Baer Jr.