The announcement confirms speculation that the Queen would be performing the honours in Southampton. She will be accompanied at the naming by the Duke of Edinburgh.
Carnival UK chairman David Dingle said: “We are honoured and proud that Her Majesty will name Britannia almost 20 years after she named the P&O Cruises ship Oriana.
“Britannia, a ship for the nation, will be the embodiment of contemporary Britain, and with her Union Jack livery she will fly the flag for Britain across the Globe.”
The biggest ship designed exclusively for Britain, Britannia is P&O Cruises’ latest vessel.
The ship will include a focus on cuisine, with 'Food Heroes' James Martin, Marco Pierre White, Atul Kochhar, Eric Lanlard, wine expert Olly Smith and cheese expert Charlie Turnbull all contributing to restaurants onboard.
Travel Weekly first reported the likelihood of The Queen naming Britannia on January 29.
