小大角战役（Battle of the Little Bighorn）是北美印第安战争战争之一，是美军与美国原住民苏族人的战争。19世纪，美国淘金热风潮大起，大批白人拓荒者蜂拥至中西部淘金，却时常遭到当地苏族人袭击，在南北战争中闻名的第七骑兵团团长佐治·岩士唐·卡士打中校奉命进兵绥剿。

1876年6月25日，卡斯特自领两百余骑兵，与马可士·雷诺少校、弗列德瑞克·班廷上尉分兵三路，进攻蒙大拿州黑山山谷。不料雷诺与班廷遇阻，自行退却。卡斯特所部孤军深入，遭酋长“疯马”与萨满“坐牛”率领的三千名苏族勇士伏击，全军覆灭。

The Battle of the Little Bighorn, known to Lakota as the Battle of the Greasy Grass, and commonly referred to as Custer's Last Stand, was an armed engagement between combined forces of the Lakota, Northern Cheyenne, and Arapaho tribes, against the 7th Cavalry Regiment of the United States Army. The battle, which occurred June 25–26, 1876, near the Little Bighorn River in eastern Montana Territory, was the most prominent action of the Great Sioux War of 1876.