Major General Stuart Heintzelman (19 November 1876 – 6 July 1935) was an American soldier.

In 1904, Heintzelman began what would become a long and distinguished association with Fort Leavenworth when he was selected as the Infantry and Cavalry School honor graduate.

After service in the Philippines, Heintzelman returned to Fort Leavenworth as an instructor followed by another academic assignment as the Professor of Military Art and Science at Princeton University.

[2] During World War I, as a general staff officer with the American Expeditionary Force, Heintzelman was responsible for planning the St. Mihiel Offensive.

Following complications from a gall bladder operation at the Army-Navy Hospital at Hot Springs, Arkansas, Heintzelman died on July 6, 1935, at the age of 58.