Dancers and dragons joined a parade around Chinatown before performers took to the stage in front of the National Gallery in Trafalgar Square.
Martial arts displays, music shows and cultural activities were also held in streets across the West End.
The event is the biggest Chinese New Year celebration outside of Asia.
People stand by a large rabbit farm as they watch a parade during celebrations on the first day of the Lunar New Year in London
Crowds lined the streets in the West End
The Chinese New Year's parade began in Charing Cross Road and featured colourful floats, with more than 50 teams taking part in the event
People in London gathered to enjoy a colourful parade, free stage performances and traditional Chinese food
Hundreds of thousands of people descend on the West End
People wore traditional Chinese costumes to celebrate the event
Chinese New Year always falls between late January and mid-February