John Trout Greble (January 19, 1834 in Philadelphia – June 10, 1861 in Virginia) was a soldier in the United States Army in the American Civil War.

He was compelled, in consequence of a severe fever, to return home on sick leave, but in the beginning of 1856 resumed his duties, acting part of the time as quartermaster and commissary until December 1856, when he was appointed acting assistant professor of geography, history, and ethics in the U.S. Military Academy, where he remained until September 24, 1860.

[1] He was detailed for active duty at Fort Monroe in late 1860, and rendered efficient service in preventing its seizure.

Just at the close of the action, when he had given the orders to withdraw his guns from the field, he was struck by a rifle ball on the right temple and instantly killed.

Their son, Edwin St. John Greble, who was born at West Point, New York, became a major general of the U.S. Army.