Richard Masur (born November 20, 1948) is an American character actor who has appeared in more than 80 films. From 1995 to 1999, he served two terms as president of the Screen Actors Guild (SAG). He is best known for playing David Kane on One Day at a Time (1975–1976), Nick Lobo on Rhoda (1974–1977), Clark in The Thing (1982), Adult Stanley Uris in the miniseries It (1990), and Edward L. L. Moore on Younger (2016–2018).

Masur was born in New York City to Jewish parents, a high school counselor mother, Claire Masur, and a pharmacist father, Jesse Masur. He has a sister Judith Masur.^[1] He attended P.S. 28, Walt Whitman Junior High School, and Roosevelt High School, Yonkers, New York. He is married to Eileen Henry.^[2][3]

Masur studied at the Yale School of Drama toward an MFA in acting and appeared on stage before acting in movies and television shows during the 1970s. He appeared on an episode of The Waltons as well as in an episode of All in the Family in late 1974 and had recurring roles in Rhoda from 1974 to 1978; One Day at a Time from 1975 to 1976; Hot l Baltimore in 1975; and the pilot to an NBC sitcom, Bumpers, in 1977. In 1981, Masur played the role of a child molestor armed with a camera in the television film Fallen Angel. His next project was the 1982 horror/sci-fi movie The Thing as the dog handler Clark.

Masur played the father to Corey Haim's character in 1988's License to Drive and was part of the ensemble cast of the 1990 TV miniseries adaptation of Stephen King's It.

Masur played the role of a character modeled after Jewish American spy Jonathan Pollard in the film Les Patriotes (The Patriots) (1994), by French director Éric Rochant.

In January 2006, Masur began appearing as a recurring character on the soap opera All My Children. He has also appeared in guest spots on many TV shows, including M*A*S*H, The Mary Tyler Moore Show, Hawaii Five-O, Happy Days, Picket Fences, Matlock, Murphy Brown, Law & Order, Kevin (Probably) Saves the World, All In The Family, and Transparent.

In December 2009, Masur played the role of Martin Stone in the off-Broadway play Dust.^[4]