Bantry Bay (Irish: Cuan Baoi / Inbhear na mBárc / Bádh Bheanntraighe) is a bay located in County Cork, Ireland. The bay runs approximately 35 km (22 mi) from northeast to southwest into the Atlantic Ocean. It is approximately 3-to-4 km (1.8-to-2.5 miles) wide at the head and 10 km (6.2 mi) wide at the entrance.
Bantry Inshore Search & Rescue Association (BISRA) provides an emergency lifeboat service to the Bantry Harbour community. Equipped with a high speed rescue RIB BISRA is a declared resource of the Irish Coastguard.
The bay is a deep (approx 40 metres in the middle) and large natural bay, with one of the longest inlets in southwest Ireland, bordered on the north by Beara Peninsula, which separates Bantry Bay from Kenmare Bay. The southern boundary is Sheep's Head Peninsula, separating Bantry Bay from Dunmanus Bay. The main islands in the bay are Bere Island and Whiddy Island. Bere Island is located near the entrance to the bay on the north side of the island is Berehaven Harbour and Castletown Bearhaven port . The town of Rerrin is the largest settlement on the island. The village of Ballynakilla is also located there. Whiddy Island is at the head of the bay near the south shore. It is the main petroleum terminus for Ireland, the harbour ideally suited for large oceangoing tankers. ConocoPhillips now maintains a Single Point Mooring (SPM) at the Whiddy Island oil terminal. Bantry Bay was featured during a famous Gulf Oil commercial showing the supertanker "Universe Kuwait" that aired during Apollo space coverage in 1971
Towns and villages around the bay include: Adrigole, Bantry, Ballylickey, Cahermore, Cappanolsha, Castletownbere (Castletown Bearhaven), Foilakill, Gerahies, and Glengarriff. Main routes that follow parts of the bay include the R572 (part of the "Ring of Beara") and the N71. The Bantry Bay Golf Club is at the head of the bay, across from Whiddy Island. The O'Sullivan Beara Castle Dunboy is just across from Bere Island in Berehaven Harbour . "Copper John" Puxley's Manor is in Dunboy.