John William Hart (July 30, 1833 – June 2, 1907) was a soldier from Maryland who fought in the American Civil War.

Hart was born July 30, 1833, in Germany[1] but migrated to the United States and settling in Maryland prior to the American Civil War.

In an area known as Devil's Den, John Hart, along with Thaddeus S. Smith, J. Levi Roush, George Mears, Chester S. Furman and Wallace W. Johnson volunteered to attack a small log cabin being held by Confederate forces.

[2] Although they attempted to approach the cabin by stealth, they were spotted and began taking fire from the enemy force locked inside.

[2] Was one of six volunteers who charged upon a log house near the Devil's Den, where a squad of the enemy's sharpshooters were sheltered, and compelled their surrender.