I Corps (South Vietnam)

I Corps
Quân đoàn I
Active	1960s–1975
Country	South Vietnam
Branch	ARVN
Type	Corps
Garrison/HQ	Quảng Trị Province Thừa Thiên-Huế Province Quảng Nam Province Quảng Tín Province Quảng Ngãi Province
Motto(s)	Bến Hải Hưng Binh, Tiên Phong Diệt Cộng (Patriotic Soldiers of Bến Hải, Pioneers in Destroying the Communists)
Engagements	Vietnam War 1971 Operation Lam Son 719 1972 Easter Offensive 1975 Spring Offensive
Commanders
Notable commanders	Hoàng Xuân Lãm Ngô Quang Trưởng
Insignia
Division flag

I Corps (Vietnamese: Quân đoàn I) was a corps of the Army of the Republic of Vietnam (ARVN), the army of the nation state of South Vietnam that existed from 1955 to 1975. It was one of four corps of the ARVN. This was the northernmost region of South Vietnam, bordering North Vietnam at the Vietnamese Demilitarized Zone (DMZ). These five provinces are Quảng Trị Province, (Khe Sanh, Đông Hà, Quảng Trị City), Thừa Thiên-Huế Province, (Phu Bai, Huế City), Quảng Nam Province, (Đà Nẵng, Hội An), Quảng Tín Province, (Tam Kỳ, Chu Lai) and Quảng Ngãi Province, (Quảng Ngãi).

I Corps became operational in November 1957.^[1]

Among its formations and units were the ARVN 1st Division. The I CTZ, later Military Region 1, was partnered with the U.S. III Marine Expeditionary Force and the XXIV Corps.