Nathaniel Collins McLean (February 2, 1815 – January 4, 1905), was a lawyer, farmer, and Union general during the American Civil War. He was appointed colonel of the 75th Ohio Infantry Regiment in 1861 and led the regiment in several battles before commanding a brigade. During the Second Battle of Bull Run, his brigade's determined defense of Chinn Ridge probably saved the Union Army from a disaster. He led a brigade at the Battle of Chancellorsville in 1863, for a month in the Atlanta campaign in 1864, and in the Carolina campaign in 1865. After the war, he returned to his law practice in Cincinnati, moved to Minnesota, and moved again to New York where he died.