|Birthname||Dennis Dirk Blocker|
|Born:||July 31, 1957|
|Birthplace||Hollywood, Los Angeles, CA, U.S.|
|Appeared on/in:||M*A*S*H (TV series)|
|Episodes appeared in:||"Identity Crisis" in Season 10|
|Character played:||James Mathes|
Dirk Blocker (born Dennis Dirk Blocker on July 31, 1957) guest stars on the CBS-TV series M*A*S*H as James Mathes, a wounded soldier whom Hawkeye tries to help get over heartbreak after he receives a "Dear John" letter from his girlfriend in the states in the Season 10 episode "Identity Crisis" (episode #3).
As an actor, Dirk is best known for his roles in the films Poltergeist (1982), Starman (1984) and Prince of Darkness (1987). He currently plays the role of Hitchcock on the FOX TV series Brooklyn Nine-Nine. He was a regular on the NBC-TV series Baa Baa Black Sheep (1976-1978), playing pilot Jerry Bragg.
Dirk is the son of actor Dan Blocker , who's famous for portraying Eric "Hoss" Cartwright on the long-running NBC Western television seriesBonanza  from 1959 until his death on May 13, 1972 from a pulmonary embolism when Dan was 14 and Dolphia Lee Blocker (née Parker). His brother is producer David Blocker .
He has been married to actress  Danielle Aubuchon Danielle Aubuchon since November 3, 1990.