George Wilhelmus Mancius Yates (February 26, 1843 – June 25, 1876) was an officer in the U.S. 7th Cavalry Regiment.

Custer helped him secure a position on General Alfred Pleasonton's staff.

According to some accounts, he is said to have taken command of the battalion after the initial fighting at Medicine Tail Coulee, where Custer may have been wounded.

Other accounts suggest that he commanded a wing of Custer's battalion, composed of Companies E and F. He was initially buried on the battlefield, but was reinterred in Fort Leavenworth National Cemetery in Fort Leavenworth, Kansas.

Yates' brother-in-law, Richard Roberts, had accompanied the Custer column as a civilian herder and part-time correspondent for the New York Sun, but had to drop out 70 miles from the Little Bighorn when his pony gave out, thereby perhaps sparing his life.