The Urban 20 (U20) is a city diplomacy initiative launched in December 2017 at the One Planet Summit in Paris under the leadership of Mayor Larreta of Buenos Aires and Mayor Hidalgo of Paris. It aims to facilitate lasting engagement between the G20 and cities, raise the profile of urban issues in the G20 agenda, and establish a forum for cities to develop a collective message and perspective to inform G20 negotiations.
The 4th Urban 20 Summit will be held in Rome. U20 Mayors and representatives of G20 cities will work together to plan a green and just recovery from the COVID-19 Pandemic.