Douglas Hapeman (1839–1905) was a Lieutenant Colonel in the 104th Illinois Infantry during the American Civil War, where he was awarded the Medal of Honor.

[1] He was born on January 15, 1839, in Ephratah, New York, and later moved to Illinois.

Hapeman was awarded the medal for his actions on July 20, 1864, at the Battle of Peachtree Creek, Georgia.

[3] After the war, he was elected as a companion of the Military Order of the Loyal Legion of the United States.

This article about a person of the American Civil War is a stub.