Cat Lo Naval Base is a former United States Navy, U.S. Coast Guard, and Republic of Vietnam Navy (RVNN) base approximately 10 kilometres (6.2 mi) northeast of Vũng Tàu in southern Vietnam that was used during the Vietnam War.

[1] In October 1965, the U.S. Navy selected Cat Lo as the base for Swift Boat Squadron 1, Division 103 with 14 Swift Boats to be based there with berthing, messing and basic repair facilities.

[2] Dredging to build the base facilities eventually took 3 years and it housed over 600 personnel.

On 22 February 1966, the newly established Division 13, Coast Guard Squadron One began operations from Cat Lo.

[3] In early 1966 PBRs of River Divisions 53 and 54 began operations from Cat Lo.