Gordon Leslie Arnold (August 14, 1941<!-- Golz reported that he was 22 at the time of the assassination (i.e. born c. 1941) --> – October 15, 1997) was a Canadian-American man who claimed to have witnessed the assassination of United States President John F. Kennedy in Dallas, Texas.
Arnold did not become known as an eyewitness to the assassination until 1978, when on August 27 of that year, The Dallas Morning News published an article by Earl Golz alleging that several "counterfeit" agents of the United States Secret Service were in Dealey Plaza shortly before and after the assassination. Witness to the assassination Senator Ralph Yarborough told Golz that "Immediately on the firing of the first shot I saw the man you interviewed throw himself on the ground....He was down within a second of the time the shot was fired and I thought to myself, ‘There’s a combat veteran who knows how to act when weapons start firing.
According to the report, Arnold and at least four other individuals said they met men who identified themselves as Secret Service agents. Arnold suggested that he had been afraid to report the incident due to claims of "peculiar" deaths of witnesses to the assassination.