III Corps tactical zone

During the Vietnam War, the III Corps tactical zone was an Army of the Republic of Viet Nam organization with geographic responsibility for Saigon and 11 surrounding provinces. It had had various earlier names, such as Saigon Military District.

III CTZ headquarters was at Bien Hoa, a suburb northeast of Saigon. U.S. II Field Force Vietnam (II FFV), its counterpart organization, was based at Long Binh.

These headquarters should not be confused with the ARVN Joint General Staff (JGS) and Military Assistance Command, Vietnam (MACV), also in the Saigon area at Tan Son Nhut. III CTZ reported to the JGS; II FFV reported to MACV.