Ca Lu Combat Base (Vietnamese: Cà Lu) was an Army of the Republic of Vietnam (ARVN) and United States Marine Corps base located on Highway or Route 9, near Krông Klang, Đa Krông District, western Quảng Trị Province, South Vietnam.

[1] The base was originally established by the ARVN to cover the infiltration route across the Vietnamese Demilitarized Zone (DMZ) through the Cam Lo river valley.

[2]: 10, 20  From August 1967 the North Vietnamese People's Army of Vietnam (PAVN) cut Route 9 between Ca Lu and Khe Sanh Combat Base.

[5]: 232  By late March Route 9 into Ca Lu had been reopened and Marine and United States Army engineers and Navy Seabees started construction of a major base near Ca Lu to include an airfield, ammunition storage facilities, bunkers and helicopter revetments and a supporting road network, named Landing Zone Stud.

[6]: 165 This article incorporates public domain material from websites or documents of the United States Marine Corps.