This is the 21st edition of the series of French-German conferences which initiated in Oberwolfach, Germany, in 1980. Since 1998, the conference has been organized under the participation of a third invited European country. This time it will be jointly organized with Spain and will take place at the Campus of Gijón of the University of Oviedo. The French German Spanish conference in optimization will take place in June 18-21 of 2024