Jacob the Liar is a 1975 war drama film directed by Frank Beyer, adapted by Beyer and Jurek Becker from the latter's novel of the same title. Set in Nazi-occupied Poland during the Holocaust, the film centers on Jakob Heym, a Polish Jew who attempts to raise the morale inside the ghetto by sharing encouraging rumors that he claims he has heard on an (imaginary) radio. The film was a co-production between East Germany and Czechoslovakia. It premiered on East German television on 22 December 1974, and was released theatrically on 18 April 1975.

Frank Paul Beyer was a German film director. In East Germany he was one of the most important film directors, working for the state film monopoly DEFA and directed films that dealt mostly with the Nazi era and contemporary East Germany. His film Trace of Stones was banned for 20 years in 1966 by the ruling SED. His 1975 film Jacob the Liar was the only East German film ever nominated for an Academy Award. After the fall of the Berlin Wall in 1989 until his death he mostly directed television films.