Britannia may mean:

In association with the Britain or the United Kingdom:

• Britannia, one of the British national emblems.
• Britannias, a series of British gold bullion coins issued since 1987, which have nominal values of 100, 50, 25, and 10 pounds.
• Britannia, the classical Roman name for the British Isles and the various administrative provinces they set up there; see Roman Britain.
• Britannia Airways, a charter airline, renamed Thomsonfly.
• HMS Britannia, seven vessels of the Royal Navy.
• The former Royal Yacht Britannia.

Other uses:

• Britannia, the fictitious world in the Ultima series of computer games.
• Britannia Beach, British Columbia.
• Britannia metal, an alloy that resembles silver.