James Theodore Dean (May 12, 1865 – June 15, 1939) was a United States Army officer in the late 19th and early 20th centuries.

[2] Dean was temporarily promoted to the rank of brigadier general on August 5, 1917, and assumed command over the 156th Infantry Brigade which he went with on a tour of duty in France.

he commanded the 78th Infantry Division between March 16 and April 20, 1918, and he participated in the Battle of Saint-Mihiel as well as the Meuse-Argonne Offensive.

[2] Reverting to the rank of colonel after the war, Dean commanded the 20th Infantry Regiment before moving to the Adjutant General's Department.

On April 23, 1924, he began overseeing military recruitment in the New York area, and after this, he served as the Chief of Staff of the 77th Infantry Division.