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The C40 World Mayors Summit 2025, co-hosted by the Mayor of London and C40 Cities Co-Chair Sadiq Khan and the Mayor of Rio de Janeiro Eduardo Paes, brought together mayors from nearly 100 C40 cities, alongside business leaders, philanthropists, investors, academics, and civil society. Taking place from 3-5 November in Rio de Janeiro, just days before COP30 in Belém, the Summit marked a critical moment for city-led climate action.
Monday, November 3, 2025 - Wednesday, November 5, 2025
London, Brazil
The C40 World Mayors Summit 2025, co-hosted by the Mayor of London and C40 Cities Co-Chair Sadiq Khan and the Mayor of Rio de Janeiro Eduardo Paes, brought together mayors from nearly 100 C40 cities, alongside business leaders, philanthropists, investors, academics, and civil society. Taking place from 3-5 November in Rio de Janeiro, just days before COP30 in Belém, the Summit marked a critical moment for city-led climate action.
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Request a DemoOr start free trial →C40 World Mayors Summit 2025 takes place on Monday, November 3, 2025 to Wednesday, November 5, 2025 in London. All times are in UTC.
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