March 31^st, 2026 : The registration plaform has now opened (see dedicated tab)! Early-bird registration fees are available for all registrations completed before April, 30^th.

The 2026 French Complex Systems Days will take place at Palais Hirsch in Lyon on June 1^st and 2^nd, 2026. It will gather the multi-disciplinary scientific community that studies complex systems:

• network analysis (for urban transport, smart grids, networks of socio-economic stakeholders, biological neural networks, ...)
• statistical approaches of collective effects in human and animal societies, socio-economic systems, and neural networks
• propagation dynamics of opinions, social unrest, crises, ...

By their very nature, these topics are located at the interface between numerous fields: Applied Mathematics, Economics, Statistical Physics, Cliometry, Social Psychology, Sociology, Computer Science, Geography. These diverse communities have an opportunity to meet and exchange ideas in the Complex System conferences.

The CSS/FR conferences are held annually and are cornerstones of the cohesion of the French scientific community involved in complex systems.