The number of people who describe themselves as "white British" in London has fallen below half for the first time ever.
45% of people in the capital are white British, according to the Census 2011. That figure has fallen from 58% in 2001 - the last time the huge survey was done.
The Census has also revealed that 1 in 3 Londoners were born outside the UK.
The news has sparked a debate on how this change affects the country.
People come from all over the world to live and work in London.
Hayley's been to London to meet kids at a school with a diverse range of backgrounds.