Eighth Corps Area was a military formation of the United States Army.
It was established on 20 August 1920 with headquarters at Fort Sam Houston, TX, and organized from portions of the discontinued Southern Department.
The Eighth Corps Area included the states of Texas, Oklahoma, Colorado, New Mexico, and Arizona.
For administrative purposes and for tactical control in connection with border patrol field operations, that part of the state of Arizona that lies west of the 114 degree meridian and south of the 33 degree parallel was attached to the Ninth Corps Area.
The installations were returned to control of the Ninth Corps Area on 1 July 1939.