Joseph Nelson Garland Whistler (October 19, 1822 – April 20, 1899) was an American Union brevet brigadier general during the period of the American Civil War. After graduating from West Point in the class of 1846, he served in the Mexican–American War where he fought in numerous battles. He later was stationed in the area of New Mexico for about a decade where he fought in skirmishes against the Apache and Navajo. During the Civil War, he was severely wounded at the Siege of Petersburg He received his appointment as brevet brigadier general dated to March 13, 1865.