Nakagusuku Bay (中城湾, Nakagusuku-wan; Okinawan: Nakagushiku-widu) is a bay on the southern coast of Okinawa Island on the Pacific Ocean in Japan. The bay covers 220 square kilometres (85 sq mi) and ranges between 10 metres (33 ft) to 15 metres (49 ft) deep. The bay is surrounded by the municipalities of Uruma, Kitanakagusuku, Nakagusuku, Nishihara, Yonabaru, Nanjō, all in Okinawa Prefecture. In 1852, while visiting the Ryukyu Kingdom, Commodore Matthew Perry mapped Okinawa and labeled Nakagusuku Bay as "Perry's Bay". During the final months of World War II, the bay became a United States Navy forward base and was nicknamed "Buckner Bay".

In June 1945, American forces secured Okinawa. Nakagusuku Bay became an important U.S. anchorage. United States Army troops referred to it as "Buckner Bay", in memory of Lieutenant General Simon Bolivar Buckner Jr., commander of U.S. land forces in the campaign, who was killed on 18 June.

Naval Base Buckner Bay was built by Naval Construction Battalion 4 on the bay. It consisted of the anchorage, repair and depot ships, plus onshore support facilities for the US fleet operating off Japan. It also served as a supply and logistics center for forces on Okinawa. It was attacked several times during the closing weeks of the war. The USS Pennsylvania was torpedoed there by a Japanese aircraft. The base continued operations into the immediate postwar period.

In October 1945, Typhoon Louise struck Buckner Bay, inflicting heavy damage. Fifteen merchant ships were driven ashore, some damaged beyond recovery. Three USN destroyers were also wrecked. Over 200 other U.S. military vessels, including six LCTs, various special-purpose boats, patrol boats, and landing craft were grounded, severely damaged, or destroyed altogether. Eighty percent of the buildings in the bay were completely wiped out, while over 60 aircraft then present at local airstrips were damaged.

In the present day, the Buckner Bay – White Beach Naval Port Facility is located on the southernmost tip of the Katsuren Peninsula. The bay is also referred to as Katchin Wan. The White Beach Navy Ammunition Pier and White Beach Army Pier extend into Nakagusuku Bay. Tatsu Kuchi, the main entrance into the bay, is located 18 nmi north-northeast of the southernmost tip of Okinawa. White Beach is also located about 14 nmi northeast of Naha. Numerous large and small islands, reefs, and shoal waters bracket the entrance.

Tengan Pier (26°24.2'N 127°51.1'E) is located at the western end of Kin Wan Bay. Kin Wan Bay is on the east central side of Okinawa between Kin Saki (Kin Point) and the Katsuren Peninsula.

There are two piers at White Beach. Navy Pier is under the control of the U.S. Navy Commander Fleet Activities Okinawa (CFAO) and is also used by the Military Sealift Command (MSC) as a back-up ordnance-handling pier. The coordinating authority for U. S. Navy vessels for both piers is Buckner Port Control, White Beach.

Navy Pier is used primarily by U.S. Navy vessels and Japanese Self-Defense Force minesweepers. The pier is approximately 2,400 ft (732 m) long. It consists of a 40 ft (12.2 m) wide by 1,220 ft (372 m) long earth-filled causeway and a 39 ft (11.9 m) wide by 386 ft (117.8 m) long structural causeway that is connected to the main pier. East Navy Pier space for berthing is 790 ft (240.8 m); West Navy Pier space for berthing is 810 ft (246.9 m). The Navy Pier has reinforced concrete pilings with a steel concrete surface. The deck height is 10 ft (3.1 m). Beyond the pier are two 25 ft (7.6 m) by 125 ft (38.1 m) mooring dolphin decks. Ships can moor bow in or bow out at these berths.