Peter Jurasik (born April 25, 1950) is an American actor known for his television roles as Londo Mollari in the 1990s science fiction series Babylon 5 and Sid the Snitch on the 1980s series Hill Street Blues and its short-lived spinoff Beverly Hills Buntz.
Among Jurasik's guest appearances are an entomologist in one episode of MacGyver, CID investigator Captain Triplett in two episodes of M*A*S*H, and Dr. Oberon Geiger on three episodes of Sliders.
Jurasik also starred as Mitch Kline in the 1983 short-lived CBS series Bay City Blues. He starred as Dr. Simon Ward in an episode of Columbo: Sex and the Married Detective in 1989.
His film roles include Crom in the film Tron (1982), with future Babylon 5 co-star Bruce Boxleitner, and as Roy, the perfect father neighbor, in Problem Child (1990).
In 1998, he wrote Diplomatic Act (ISBN 0-671-87788-7) with William H. Keith, Jr., a science fiction novel wherein the lead character, an actor in a science fiction show, is kidnapped by aliens who think he is the character from the program. The book is similar in tone and story to Galaxy Quest, which was released one year later.
In 2000, Jurasik appeared in the Doctor Who audio adventure Winter for the Adept.