World Mayors Summit 2025
Mayors, governors, and local leaders will meet in Rio de Janeiro, Brazil, between 3-5 November, to align on climate action, finance, and just transition, ensuring cities are at the centre of the global agenda.
Durban (eThekwini)
Nairobi
Yokohama
Copenhagen
Santiago
Hanoi
Shenzhen
Dar es Salaam
Delhi NCT
Qingdao
Cape Town
Athens
Los Angeles
Montréal
São Paulo
Shanghai
Dalian
Johannesburg
Addis Ababa
Casablanca
Zhenjiang
Dakar
Rome
New Orleans
Mexico City
San Francisco
Rotterdam
Austin
Ekurhuleni
Beijing
New York City
Medellín
Tokyo
Durban (eThekwini)
Nairobi
Yokohama
Copenhagen
Santiago
Hanoi
Shenzhen
Dar es Salaam
Delhi NCT
Qingdao
Cape Town
Athens
Los Angeles
Montréal
São Paulo
Shanghai
Dalian
Johannesburg
Addis Ababa
Casablanca
Zhenjiang
Dakar
Rome
New Orleans
Mexico City
San Francisco
Rotterdam
Austin
Ekurhuleni
Beijing
New York City
Medellín
Tokyo
Washington, DC
Freetown
Paris
Ahmedabad
Barcelona
Kuala Lumpur
Mumbai
Fortaleza
Hong Kong
Amsterdam
Seoul
Chicago
Quito
Boston
Rio de Janeiro
Madrid
Lisbon
Jakarta
Buenos Aires
Istanbul
Melbourne
Bengaluru
Ho Chi Minh City
Wuhan
Bangkok
Vancouver
Tshwane
Tel Aviv – Yafo
Singapore
Milan
Heidelberg
Philadelphia
Phoenix
Washington, DC
Freetown
Paris
Ahmedabad
Barcelona
Kuala Lumpur
Mumbai
Fortaleza
Hong Kong
Amsterdam
Seoul
Chicago
Quito
Boston
Rio de Janeiro
Madrid
Lisbon
Jakarta
Buenos Aires
Istanbul
Melbourne
Bengaluru
Ho Chi Minh City
Wuhan
Bangkok
Vancouver
Tshwane
Tel Aviv – Yafo
Singapore
Milan
Heidelberg
Philadelphia
Phoenix
Miami
Chengdu
Curitiba
Amman
Salvador
Lagos
Quezon City
Guangzhou
Abidjan
Lima
Karachi
Oslo
Stockholm
Nanjing
Auckland
Guadalajara
Dhaka (North & South)
Houston
Sydney
Bogotá
Warsaw
London
Fuzhou
Accra
Dubai
Portland
Chennai
Seattle
Hangzhou
Toronto
Berlin
Miami
Chengdu
Curitiba
Amman
Salvador
Lagos
Quezon City
Guangzhou
Abidjan
Lima
Karachi
Oslo
Stockholm
Nanjing
Auckland
Guadalajara
Dhaka (North & South)
Houston
Sydney
Bogotá
Warsaw
London
Fuzhou
Accra
Dubai
Portland
Chennai
Seattle
Hangzhou
Toronto
Berlin
C40 has
97
member cities
Making up more than
22%
of the global economy1
Accelerator Reports
Latest Reports Now Available
Since 2017, 74 forward-thinking C40 cities have been driving transformative action in critical sectors through C40’s High-Impact Accelerators.
In the latest Accelerator Reports, we celebrate the progress and impact of cities’ climate actions.
Latest News
October 20, 2025
October 17, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.