The gannet is a seabird. It may also refer to:

• Gannet Island (Western Australia)
• Gannet Islands,, Labrador, Canada - see Gannet Islands Ecological Reserve
• Kārewa / Gannet Island, New Zealand
• Gannet Rock, New Zealand
• Gannet Lake, Georgia, United States

• Colyaer Gannet S100, a Spanish flying boat
• Fairey Gannet, a British Cold-War era naval aircraft
• Gloster Gannet, a British pre-Second World War aircraft
• Grumman Gannet, the original name for the British Fleet Air Arm version of the Grumman Hellcat fighter
• Tugan Gannet, a small, twin-engine airliner built in Australia in the 1930s

• HMS Gannet, nine Royal Navy ships and two shore establishments
• USS Gannet (AM-41), a minesweeper laid down in 1918
• USS Gannet (MSC-290), a minesweeper laid down in 1959

• Gannet oil and gas field, North Sea

• Gannett (disambiguation)