Eastern Division of the United States Army was one of its superior administrative organizations that existed during the mid-19th century and for a short time in the early 20th century.
It had a subordinate 7th Military Department until 1841, and it was eliminated in 1842.
From 1848 to 1853 the Eastern Division had 4 subordinate departments.
The Department of the East absorbed the four numerated departments (1st-4th) of the Eastern Division, with boundaries encompassing all the states east of the Mississippi River.
In 1913, the “Stimson Plan” again eliminated the division administrative echelon.