Dear colleagues, This is the final announcement for the conference 'Dérivateurs à Barcelone’, to be held in the University of Barcelona from Tuesday 1 to Friday 4 September 2015. Titles, abstracts, and a schedule can be already found in: http://www.ub.edu/Derivateurs2015/ The registration deadline is August 25, but if you wish some help with lodging it would be better to register sooner. Best regards, — The organizing committee Leo Alonso (Santiago de Compostela) Carles Casacuberta (Barcelona) Ana Jeremías (Santiago de Compostela) Georges Maltsiniotis (Jussieu) Fernando Muro (Sevilla) [For admin and other information see: http://www.mta.ca/~cat-dist/ ]