John L. Plaster (born 1949) is a former United States Army Special Forces officer regarded as one of the leading sniper experts in the world. A decorated Vietnam War veteran who served in the covert Studies and Observations Group (SOG), Plaster co-founded a renowned sniper school that trains military and law enforcement personnel in highly specialized sniper tactics. He is the author of The Ultimate Sniper: An Advanced Training Manual for Military and Police Snipers, The History of Sniping and Sharpshooting, and Secret Commandos: Behind Enemy Lines with the Elite Warriors of SOG, a memoir of his 3 years of service with SOG.