The Citizenship, Action, Participation for the 21st Century (French: Citoyenneté, action, participation pour le xxie siècle) was a minor green liberal political party in France, founded by Corinne Lepage in 1996 as a political reflection club.

The party later refused to join the new centre-right Union for a Popular Movement (UMP).

Corinne Lepage became a high-ranking member of the MoDem's leadership, serving as a Vice President.

However, the party split from the MoDem in the runup to the 2010 regional elections and pursued an alliance with Europe Écologie.

Lepage subsequently failed to obtain the 500 endorsements necessary to run in the 2012 presidential election.