Comprised of 21 representatives from the French government and regional communities, the Supervisory Board ensures oversight for Société du Grand Paris. It approves the agency's policy guidelines and audits its financial statements, as well as development and construction operations.

The Audit and Commitments Committee (ACC) informs the Supervisory Board about Société du Grand Paris's policies on investment, audits, internal controls, and risk management, as well as provides insight on the opinions and comments issued by the Board. It also manages budgeting, finance and accounting.

Elected officials

• Karim Bouamrane
  Chair of the Supervisory Board Mayor of Saint-Ouen-sur-Seine, Vice-President of the Seine-Saint-Denis administrative department charged with culture.
   
• Valérie Pécresse
  Chair of the Ile-de-France Regional Council.
   
• Anne Hidalgo
  Mayor of Paris
   
• Georges Siffredi
  Chair of the Hauts–de-Seine Departmental Council
   
• Stéphane Troussel
  Chair of the Seine-Saint-Denis Departmental Council
   
• Jean-François Parigi
  Chair of the Seine-et-Marne Departmental Council
   
• Pierre Bedier
  Chair of Les Yvelines Departmental Council
   
• François Durovray
  Chair of the Essonne Departmental Council
   
• Olivier Capitanio
  Chair of the Val-de-Marne Departmental Council
   
• Marie-Christine Cavecchi
  Chair of the Val-d’Oise Departmental Council

Representatives of the French government

• Thierry Coquil
  Vice-chair of the Supervisory Board Managing Director of Infrastructures, Transportation and Mobility at the Ministry of Ecological Transition
   
• Jean Bensaid
  Director of the Infrastructure Project Financing Mission - Treasury Department
   
• Aurélie Cousi
  Department Head, Deputy Managing Director of Heritage charged with Architecture - Department of Heritage
   
• Agnès Reiner
  Delegated Managing Director - National Agency of Regional Cohesion
   
• Emmanuelle Gay
  Regional and Interdepartmental Director of Equipment and Development of Ile-de-France
   
• Emmanuel de Lanversin
  Assistant to the Director of Habitat, Urban Planning and Landscapes
   
• Stanislas Bourron
  Managing Director of Local Municipalities
   
• Stéphan de Faÿ
  Managing Director of the public institution Grand Paris Aménagement
   
• Claudie Calabrin
  Head of the Office of Strategy, Government Contracting and Assessment
   
• Laurent Pichard
  Deputy Budget Director
   
• Béatrice Bellier-Ganiere
  Department Head, Assistant to the Director of Government Property

They also attend Supervisory Board meetings

• Marc Guillaume
  Prefect of the Ile-de-France Region, Prefect of Paris Government Commissioner
   
• Philippe Dupuis
  Inspector General of Finance Budget Controller

The three members of the Société du Grand Paris Management Board :

• Jean-François Monteils, Chair
• Bernard Cathelain
• Frédéric Brédillot
• Marie-Christine Baranger, Accountant for Société du Grand Paris

The Strategy Committee is composed of elected officials from communities affected by the Grand Paris Express and socio-economic stakeholders from the Paris region. Its 182 members debate and issue proposals on the new metro and neighbourhoods near its stations.

The Scientific Council of Economists is composed of economists reputed for their research in geographical economics, and the economic and societal impacts of major transport infrastructure projects.

• Dominique Bureau, Chair, Chief Engineer of the Corps of Bridges, Waters and Forests, Delegate. General of the Economic Council on Sustainable Development, and chair of the Public Statistics Authority
• Émile Quinet, Rapporteur General, Chief Engineer of Bridges and Roads, Professor at the Paris School of Economics.
• Kristian Behrens, Professor at Université du Québec in Montreal.
• Françoise Maurel, Inspector General of INSEE.
• Jean-Paul Ourliac, Honorary Chief Engineer of Bridges and Roads.
• Frédéric Robert-Nicoud, Professor at the University of Geneva.
• Andrés Rodríguez-Pose, Professor at the London School of Economics.
• Richard G. Shearmur, Dean of the School of Urban Planning-McGill University in Montreal.
• Jacques-François Thisse, Professor at UCLouvain.
• Kurt Van Dender, Head of the Tax and Environment Unit, OECD.
• Jean-Luc Tavernier, Managing Director of INSEE (French national institute for statistical and economic studies).
• Michel Yahiel, Commissioner General of France Stratégie.
• Agnès Bénassy-Quéré, Delegated Chair of the Economic Analysis Council.

The Evaluation Board of the Grand Paris Express is tasked with assessing the economic, urban, social, and regional aspects of the project.

The cohort that sits on the Board are experts known for their skills and experience in their respective fields :

• Dominique Bureau, Chief Engineer of the Corps of Bridges, Waters and Forests, Delegate General of the Economic Council on Sustainable Development, and chair of the Public Statistics Authority.
• Emmanuel Bellanger, Research Director at the CNRS Centre of 20th Century Social History.
• Vincent Kaufmann, Professor at the Swiss Federal Institute of Technology Lausanne and Director of the Urban Sociology Laboratory.
• Jacques Lévy, Professor of geography and urban planning at the Swiss Federal Institute of Technology Lausanne and Director of the Chôros Laboratory.
• Jean-Marc Offner, Managing Director of the Urban Planning Agency of Bordeaux Aquitaine Metropolitan Area.
• Jean-Paul Ourliac, Honorary Chief Engineer of Bridges and Roads.
• Émile Quinet, Professor Emeritus at École des Ponts ParisTech.
• Jacques-François Thisse, Professor Emeritus at UCLouvain.
• Taoufik Souami, Professor at the Paris School of Urban Planning East Marne-la-Vallée.

This Board also includes the chairs of Société du Grand Paris's Supervisory Board, Strategy Committee, and Management Board.
 
Consulting is also provided by Dominique Alba, Managing Director of APUR, Marie-Christine Parent, Regional Director Ile-de-France of INSEE, and Fouad Awa, Managing Director of IAURIF.

The Expert Panel on Cultural Action advises Société du Grand Paris on the cultural programme aimed at building a new architectural and artistic heritage.

Project implementation and description (2013-2015)

• François Barré, former Chair of the Pompidou Centre, Chair of Frac Ile-de-France.
• Fazette Bordage, Founding President of the Mains d’Œuvres Association in Saint-Ouen, Co-founder of the TransEuropeHalles network, Director of Cultural Initiatives for the City of Le Havre.
• Nicolas Bourriaud, Director of Beaux-Arts de Paris.
• Mélanie Bouteloup, Director of the Bétonsalon Centre of Art and Multidisciplinary Research.
• Alexia Fabre, Chief Curator of the Val-de-Marne Museum of Contemporary Art (MAC/VAL).
• Françoise Huguier, photographer and artistic director.
• Josep Ramoneda, journalist and philosopher, former Director of the Barcelona Centre of Contemporary Culture (CCCB).

Programme monitoring (since 2016)

• Paula Aisemberg, Director of Maison Rouge in Paris.
• Jean-François Chougnet, Director of MuCEM in Marseilles.
• Zoë Gray, Commissioner General of Wiels in Brussels.
• Ermanno Tedeschi, gallery owner in Turin.

Two observatories were spearheaded by Société du Grand Paris :

• The Land and Real Estate Pricing Observatory, a joint effort of the Ile-de-France region prefecture, and the Paris Chamber of Public Notaries. The Observatory was created in 2013 to track price trends for all types of land and real estate in the vicinity of Grand Paris Express stations, and to provide analysis reports to stakeholders.
• The SME Observatory was formed in 2017 to oversee compliance with the provision to ensure small- and medium-sized business are provided access to contracts and to increase their involvement in the project. It is comprised of chambers of commerce, employers organisations, INSEE (French national institute for statistical and economic studies), and trade federations in the Paris area.

Members of the SME Observatory : 

• The Chamber of Commerce and Industry (CCI) Paris Ile-de-France
• The Chamber of Trades and Crafts (CRMA) Ile-de-France
• The Federation of Small- and Medium-Sized Enterprises (CPME) Ile-de-France and Paris
• The Regional Federation of Public Works (FRTP)
• The French Building Federation (FFB)
• Medef Ile-de-France
• INSEE (French national institute for statistical and economic studies)
• Direccte Ile-de-France

There is also a Station Neighbourhood Observatory, which was set up by APUR (Paris urban planning workshop) in partnership with Société du Grand Paris and DRIEA (Regional and Interdepartmental Department of Equipment and Development) of Ile-de-France. Created in 2013 as a knowledge and analysis tool for all the neighbourhoods around the future Grand Paris Express stations, it researches each area and cross-references them within a scope encompassing the lines to be built.