Glynnis O'Connor (born November 19, 1955) is an American actress, perhaps best-known for her work in the mid-1970s, including her lead actress roles in the TV version of Our Town and the films Ode to Billy Joe and Jeremy, all of which co-starred Robby Benson.

O'Connor was born in New York City, the daughter of stage, film and TV actress Lenka Peterson and Daniel O'Connor, a film producer. She appeared in the 1976 tearjerker, the John Travolta - Diana Hyland feature film, The Boy in the Plastic Bubble. As of the late 1990s and continuing into 2004, she has had a recurring role as Anne Paulsen on Law & Order. In 2007, she starred in the independent feature film "P.J.", co-starring John Heard, Vincent Pastore and Robert Picardo, and is also appearing in the film Our Last Days as Children.