Patriot Games is a thriller novel, written by Tom Clancy and published in July 1987. Without Remorse, released six years later, is an indirect prequel, and it is chronologically the first book featuring Jack Ryan, the main character in most of Clancy's novels. The novel focuses on Ryan being the target of Irish terrorist group Ulster Liberation Army for thwarting their kidnapping attempt on the Prince and Princess of Wales in London. It debuted at number one on the New York Times bestseller list. A film adaptation, starring Harrison Ford as Ryan, premiered on June 5, 1992.

Thomas Leo Clancy Jr. was an American novelist. He is best known for his technically detailed espionage and military-science storylines set during and after the Cold War. Seventeen of his novels have been bestsellers and more than 100 million copies of his books have been sold. His name was also used on screenplays written by ghostwriters, nonfiction books on military subjects occasionally with co-authors, and video games. He was a part-owner of his hometown Major League Baseball team, the Baltimore Orioles, and vice-chairman of their community activities and public affairs committees.