The Battle of Pease Bottom, also called the Battle of the Bighorn River, is a conflict between the United States Army and the Sioux on August 11, 1873 along the Yellowstone River opposite the mouth of the Bighorn River near present-day Custer, Montana.

This is former Crow Indian country altered into U.S. territory on May 7, 1868.

The main combatants are units of the 7th U.S. Cavalry under Lieutenant Colonel George Armstrong Custer, and Native Americans from the village of the Hunkpapa medicine man, Sitting Bull, many of whom will clash with Custer again approximately three years later at the Battle of the Little Big Horn in the Crow Indian Reservation.