The festivities will kick off on 3 November with the World premiere of Disney's new 3D adaptation of A Christmas Carol in Leicester Square, which will mark the UK's biggest 3D screening to date.
A series of Dickensian-style public concerts, events and a world record gathering of carol singers will follow, transforming the West End and City into a hive of activity.
To mark the occassion, the world famous Christmas lights on Regent and Oxford Street will be switched on simultaneously for the first time in their history.
"With Disney's dazzling lights, plus events in the West End and the City, it's going to be one of the biggest festive celebrations the capital has ever seen," said Johnson.
The celebrations will conclude on 5 January.
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