Rush to Judgment: A Critique of the Warren Commission's Inquiry into the Murders of President John F. Kennedy, Officer J.D. Tippit and Lee Harvey Oswald is a 1966 book by American lawyer Mark Lane. It is about the assassination of United States President John F. Kennedy and takes issue with the investigatory methods and conclusions of the Warren Commission. The book's introduction is by Hugh Trevor-Roper, Regius Professor of History at the University of Oxford. Although it was preceded by a few self-published or small press books, Rush to Judgment was the first mass market hardcover book to confront the findings of the Warren Commission.

The assassination of President John F. Kennedy on November 22, 1963 has spawned numerous conspiracy theories. These theories allege the involvement of the CIA, the Mafia, Vice President Lyndon B. Johnson, Cuban Prime Minister Fidel Castro, the KGB, or some combination of these individuals and entities. Some conspiracy theories have alleged a coverup by parts of the federal government, such as the original FBI investigators, the Warren Commission, or the CIA. Former Los Angeles District Attorney Vincent Bugliosi estimated that a total of 42 groups, 82 assassins, and 214 people had been accused at one time or another in various conspiracy scenarios.