Without Remorse is a thriller novel, written by Tom Clancy and published on August 11, 1993. Set during the Vietnam War, it serves as an origin story of John Clark, one of the recurring characters in the Ryanverse. Without Remorse introduces Clark as former Navy SEAL John Kelly and explains how he changed his name. G.P. Putnam's Sons paid $14 million for the North American rights, a record for a single book. The book debuted at number one on The New York Times Best Seller list.

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.