Ian Fishback (January 19, 1979 – November 19, 2021) was a United States Army officer, who became known after he sent a letter to Senator John McCain of Arizona on September 16, 2005, in which Fishback stated his concerns about the continued abuse of prisoners held under the auspices of the Global War on Terror. After receipt of his letter, McCain, along with Republican Senators John Warner and Lindsey Graham, wrote an amendment to a Senate bill that would make illegal previous Bush administration claims for the use of extreme methods of abuse.