Movies:
* The Day of the Jackal (1973): A film adaptation of Forsyth's novel of the same name, starring Edward Fox and Michael Lonsdale.
* The Odessa File (1974): Based on Forsyth's novel, this movie stars Jon Voight and Maximilian Schell.
* The Dogs of War (1980): Adapted from Forsyth's novel, the film features Christopher Walken and Tom Berenger.
* The Fourth Protocol (1987): Another adaptation of Forsyth's book, starring Michael Caine and Pierce Brosnan.
* The Negotiator (1998): While not a direct adaptation, the film features a character named "Frank" who is a former SAS soldier, inspired by Forsyth's writing.
Television Series:
* The Day of the Jackal (1973): A miniseries based on Forsyth's novel, featuring Edward Fox.
* The Odessa File (1986): A miniseries adaptation of Forsyth's novel, starring Jon Voight and Maximilian Schell.
* The Fourth Protocol (1987): A miniseries adaptation of Forsyth's novel, starring Michael Caine.
* Forsyth's The Negotiator (1997): A miniseries based on Forsyth's novel, starring James Woods.
It's worth noting that Forsyth himself did not act in any of these projects. He was primarily involved as the author of the source material.