Henry Tureman Allen (April 13, 1859 – August 29, 1930) was a United States Army officer known for exploring the Copper River in Alaska in 1885 along with the Tanana and Koyukuk rivers by transversing 1,500 miles (2,400 km) of wilderness. His trek has been compared by General Nelson A. Miles to that of Lewis and Clark.Henry was born in Sharpsburg, Kentucky. He graduated from West Point in 1882, and was commissioned as a second lieutenant in the cavalry.