The 2015 figures have been released by the Office for National Statistics International Passenger Survey (IPS) and represent a 5.9% increase on the same period in 2014.
The growth in visitor numbers is also being enjoyed across the country, with 10.5 million visits made in the same period across the UK, representing a 4.7% increase.
The Mayor of London Boris Johnson MP said: “London is the best big city on the planet. We really know how to roll out the red carpet and put on a show for the millions of visitors who flock here year after year.
