Britannia may refer to:
- Britannia Royal Naval College, the Royal Navy's officer training establishment at Dartmouth, Devon.
- Britannia Building Society, a British mutual institution.
- Britannia coin, a British bullion coin issued since 1987.
- Britannia Industries, a biscuitmaking company in India.
- Britannia metal, an alloy of pewter.
- Britannia Secondary School, a school in Vancouver, British Columbia, Canada.
- Britannia silver, an alloy of silver.
- Britannia Stadium, the home of the English association football team Stoke City F.C.
- Britannia Theatre, a former theatre in Hoxton, London.
In geography:
- Roman Britain, the province of the Roman Empire called Britannia.
- Britannia the original Latin name the Roman Empire gave to the island of Great Britain.
- Britannia (Ottawa), a neighbourhood in Ottawa, Ontario, Canada.
- Britannia Beach, British Columbia, a small town near Vancouver, British Columbia, Canada.
- Britannia, Calgary, a neighbourhood in Calgary, Alberta, Canada.
In games:
- Britannia (Ultima), a land in the Ultima game series.
- Britannia (Ultima Online), the setting of the game Ultima Online.
- Britannia (board game), a historical board game.
In transportation:
- Britannia Airways, a UK based charter airline.
- HMS Britannia, several Royal Navy warships.
- HMY Britannia, a British Royal Racing Yacht.
- HMY Britannia, a British Royal Yacht.
- RMS Britannia, an ocean liner of the British Cunard Steamship Lines.
- BR standard class 7, the British Railways "Britannia class" steam locomotives.
- 70000 Britannia, the first of the class.
- Bristol Britannia, an airliner built by the Bristol Aeroplane Company in 1952.
- Brittannia (ship), a whaler wrecked in 1806 of the coast of Australia.
In publications:
- Britannia (book), William Camden's great work of chorography, 1st edition, 1586.
- Britannia (journal), a Journal of Romano-British and Kindred Studies, published annually by The Roman Society.
- Britannia (magazine), a publication for expatriate Britons.
- Britannia (newspaper), a newspaper of the suffragettes (WSPU) renamed during World War I.
In music:
- Rule, Britannia!, a British patriotic anthem written by Thomas Arne in the 18th century.
Britannia can also refer to:
- Headley Britannia, an eventing mare born in 1993.
- Pugnaces Britanniae, an extinct breed of fighting dog.
- Holy Britannia Empire, a fictional superpower in the anime series Code Geass: Lelouch of the Rebellion.
