Boris Johnson says he supports plans to redevelop parts of the Southbank Centre - but the skaters must remain in the current undercroft.
Speaking at a planning meeting at City Hall, Mr Johnson said:
"The skate park is the epicentre of UK skateboarding and is part of the cultural fabric of London. This much-loved community space has been used by thousands of young people over the years.
"It attracts tourists from across the world and undoubtedly adds to the vibrancy of the area - it helps to make London the great city it is."
More top news
The Rightmove September House Prices survey is out today, revealing how house prices are changing in every London borough.
TfL has announced plans to redevelop 55 Broadway, the historic home of London Underground. But the plans are under fire from Labour.
Prince Harry's Invictus Games is hailed a success as it closes with star performances from the Kaiser Chiefs, Ellie Goulding and Diversity.