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.
Athens
Amman
Phoenix
Zhenjiang
Lisbon
Bogotá
Hanoi
Heidelberg
Berlin
Tel Aviv – Yafo
Dubai
Abidjan
Shenzhen
Seoul
London
Medellín
Qingdao
Madrid
Rome
Washington, DC
Fortaleza
Boston
New York City
San Francisco
Freetown
Austin
Fuzhou
Addis Ababa
Dar es Salaam
Mexico City
Tokyo
Chennai
Chengdu
Athens
Amman
Phoenix
Zhenjiang
Lisbon
Bogotá
Hanoi
Heidelberg
Berlin
Tel Aviv – Yafo
Dubai
Abidjan
Shenzhen
Seoul
London
Medellín
Qingdao
Madrid
Rome
Washington, DC
Fortaleza
Boston
New York City
San Francisco
Freetown
Austin
Fuzhou
Addis Ababa
Dar es Salaam
Mexico City
Tokyo
Chennai
Chengdu
Salvador
Jakarta
Delhi NCT
Lima
Beijing
Kuala Lumpur
Buenos Aires
Hong Kong
Vancouver
Guadalajara
Auckland
São Paulo
New Orleans
Sydney
Paris
Philadelphia
Guangzhou
Bengaluru
Montréal
Houston
Santiago
Singapore
Hangzhou
Ekurhuleni
Durban (eThekwini)
Oslo
Dalian
Nanjing
Chicago
Tshwane
Seattle
Karachi
Yokohama
Salvador
Jakarta
Delhi NCT
Lima
Beijing
Kuala Lumpur
Buenos Aires
Hong Kong
Vancouver
Guadalajara
Auckland
São Paulo
New Orleans
Sydney
Paris
Philadelphia
Guangzhou
Bengaluru
Montréal
Houston
Santiago
Singapore
Hangzhou
Ekurhuleni
Durban (eThekwini)
Oslo
Dalian
Nanjing
Chicago
Tshwane
Seattle
Karachi
Yokohama
Johannesburg
Mumbai
Casablanca
Quezon City
Warsaw
Dhaka (North & South)
Accra
Nairobi
Quito
Bangkok
Stockholm
Los Angeles
Ho Chi Minh City
Dakar
Copenhagen
Cape Town
Lagos
Melbourne
Barcelona
Rio de Janeiro
Ahmedabad
Wuhan
Portland
Milan
Shanghai
Toronto
Istanbul
Miami
Curitiba
Amsterdam
Rotterdam
Johannesburg
Mumbai
Casablanca
Quezon City
Warsaw
Dhaka (North & South)
Accra
Nairobi
Quito
Bangkok
Stockholm
Los Angeles
Ho Chi Minh City
Dakar
Copenhagen
Cape Town
Lagos
Melbourne
Barcelona
Rio de Janeiro
Ahmedabad
Wuhan
Portland
Milan
Shanghai
Toronto
Istanbul
Miami
Curitiba
Amsterdam
Rotterdam
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.