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
Police investigating the murder of a grandfather from West Ham have arrested a second man on suspicion of murder.
Police are appealing for information after a woman was killed and three people injured after a crash in east London.
A restaurant where pets and their owners can share a meal together has opened just in time for Valentine's Day.