USS Bulloch County (LST-509) was an LST-491-class tank landing ship built for the United States Navy during World War II.

During World War II, LST-509 was assigned to the European Theater and participated in the Invasion of Normandy in June, 1944.

Other duties included coastal picket and resupply duty during Operation Market Time in which she resupplied and provided off-patrol berthing for Patrol Craft Fast crews interdicting Viet Cong communication and supply routes.

On 8 April 1970, the ship was decommissioned and leased to the Republic of Vietnam under the Security Assistance Program for service as Qui Nhon (HQ-504).

The Vietnam People's Navy, in an effort to save her, tried to bring her to Cam Ranh Bay for repair but she sank south of Great Discovery Reef in the Spratly Islands area.