A gulf in geography is a large bay that is an arm of an ocean or sea. Not all geological features which could be considered a gulf have "Gulf" in the name, for example the Bay of Bengal or Arabian Sea.^[1][2]

The term may refer to:

• Gulf of Aden, off the southwestern corner of the Arabian Peninsula
• Gulf of Alaska, in the Pacific Ocean, south of the state of Alaska
• Albay Gulf, in the southern part of Luzon
• Ambracian Gulf, of the Ionian Sea in northwestern Greece
• Amundsen Gulf, in the Arctic Ocean, northwest of Canada
• Gulf of Aqaba, in the northern end of the Red Sea
• Argolic Gulf, of the Aegean Sea off the east coast of the Peloponnese, Greece
• Asid Gulf, in the municipality of Milagros, Masbate, Philippines
• Gulf of Bahrain, inlet of the Persian Gulf on the east coast of Saudi Arabia
• Gulf of Biscay, between France and Spain
• Gulf of Boothia, in Nunavut, Canada
• Gulf of Bothnia, part of the Baltic Sea between Sweden and Finland
• Gulf of Burgas, Black Sea, Bulgaria
• Gulf of Cádiz, part of the Atlantic Ocean off the southern border of Spain and Portugal
• Gulf of California, in the Pacific Ocean in northwestern Mexico
• Cambridge Gulf, on the north coast of Western Australia
• Gulf of Carpentaria, in Northern Australia
• Gulf of Cazones, in southern Cuba
• Gulf of Corinth, of the Ionian Sea separating the Peloponnese from western mainland Greece
• Gulf of Corryvreckan, off the west coast of mainland Scotland
• Davao Gulf, in Davao City, Mindanao, the Philippines
• Exmouth Gulf, gulf in North West Australia
• Gulf of the Farallones, between the Farallon Islands and the mainland coast of California, United States
• Gulf of Finland, between the southern coast of Finland and the northern coast of Estonia in the Baltic Sea
• Gulf of Fonseca, of the Pacific Ocean in El Salvador, Honduras, and Nicaragua
• Gulf of Gabès, gulf on Tunisia's east coast in the Mediterranean Sea, off North Africa
• Gulf of Genoa, inside the Ligurian Sea on the northwestern coast of Italy
• Gulf of Gonâve, in the Caribbean Sea off the coast of Haiti
• Gulf of Guinea, in the Atlantic Ocean off the coast of Equatorial Africa
• Gulf of Hammamet, in northeastern Tunisia

• Hauraki Gulf, of the North Island of New Zealand
• Gulf of Honduras in the Caribbean Sea between Belize, Guatemala, and Honduras

• Gulf Islands close to Vancouver Island and within the Strait of Georgia within British Columbia
• Gulf of İzmir in the Aegean Sea between Turkey and Greece
• Gulf of Khambhat in the Arabian Sea, formerly known as the Gulf of Cambay
• Gulf of Kuşadası
• Gulf of Kutch in the Arabian Sea
• Lagonoy Gulf in the Philippines
• Leyte Gulf, in Eastern Visayas, Philippines
• Lingayen Gulf, off western Luzon, the Philippines, in the South China Sea
• Gulf of Lion, a bay on the Mediterranean coastline of Languedoc-Roussillon and Provence in France
• Gulf of Maine, off the States of Maine, New Hampshire, and Massachusetts in the United States, and the Canadian Provinces of New Brunswick, and Nova Scotia in the Atlantic Ocean
• Malian Gulf
• Gulf of Mannar, between India and Sri Lanka
• Gulf of Mexico, between Mexico, the United States, and Cuba
• Gulf of Morbihan, a natural harbor on the coast of the Département of Morbihan in the south of Brittany
• Gulf of Nicoya, in Costa Rica. Central America.
• Gulf of Odessa
• Gulf of Oman, between the southeastern Arabian Peninsula, Iran, Pakistan and Arabian Sea.
• Gulf of Oristano, near Oristano on the Western Sardinian coast
• Gulf of Panama in the Pacific Ocean south of Panama
• Panay Gulf, in the Western Visayas, Philippines
• Gulf of Paria, in the Caribbean Sea between Trinidad and Tobago and Venezuela
• Persian Gulf between Iran and the Arabian Peninsula
• Peter the Great Gulf in the Sea of Japan
• Ragay Gulf in the Philippines
• Gulf of Riga in the Baltic Sea
• Gulf of Roses, the most northeastern bay on the Catalan coast
• Gulf of Saint Lawrence, the world's largest estuary and the outlet of the Saint Lawrence River into the Atlantic Ocean
• Gulf St Vincent, Separated from Spencer Gulf by the Yorke Peninsula
• Gulf of Salerno, which extends from Amalfi to Paestum across Salerno.
• Saronic Gulf, which extends into Greece from the Aegean Sea.
• Gulf of Sirte, just north of Libya in the Mediterranean
• Spencer Gulf, near Port Lincoln, South Australia
• Gulf of Suez in the northern end of the Red Sea, leading to the Suez Canal
• Gulf of Taranto in the Mediterranean between the toe and the heel of Italy
• Gulf of Tartary between Russia and Sakhalin
• Gulf of Thailand just south of Thailand in the Pacific Ocean South China Seas
• Gulf of Tonkin just east of northern Vietnam in the Pacific Ocean
• Gulf of Tunis in the Mediterranean off the coast of Tunisia
• Gulf of Varna, Black Sea, Bulgaria
• Gulf of Venice, at the head of the Adriatic Sea between Italy, Slovenia and Croatia
• Moro Gulf, the largest gulf in the Philippines off the coast of Mindanao