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: