Anson George McCook (October 10, 1835 – December 30, 1917) was an American military and political figure who served as Union Army colonel during the Civil War.

However, he did not get to establish his own legal career as the Civil War erupted and McCook offered his services to the army, following President Abraham Lincoln's call for volunteers to put down the rebellion.

During the Atlanta Campaign, McCook commanded a brigade of infantry and was distinguished by his actions at the Battle of Peachtree Creek, where his coolness under fire and his tactical leadership won acclaim in the official reports.

Governor John Brough named McCook as the colonel of the newly raised 194th Ohio Infantry, a one-year regiment which served in the Shenandoah Valley under Philip Sheridan.

He served as the U.S. assessor of internal revenue taxes from November 1865 until May 1873, when he moved to New York City, established a law practice, and entered politics.

He became close friends with several leading Republicans, including former comrades in arms James Garfield, Rutherford B. Hayes, and Ohio Senator John Sherman.

McCook was elected to the United States House of Representatives in the Forty-fifth Congress as a delegate from Lower Manhattan, and served from 1877 until 1883.