The XXVth IUPAC Symposium on Photochemistry will be held July 13 - 18, 2014 at the Palais des Congrès in Bordeaux, France. Please join us in celebrating the 25th edition of one of the most successful conference series in the field of photochemistry. It will be a memorable event that you will not want to miss! The conference series was initially started in 1964 in Strasburg, France, thanks to the vision of a group of colleagues who saw that photochemistry would develop into an important branch of science and that a regular international forum for exchanging ideas was essential. That this is still true today is evident from the success of previous symposia in Portugal, (2012), Italy (2010), Sweden (2008), Japan (2006), and prior meetings. To celebrate the 50th anniversary of the conference, we have invited some of the most talented scientists in the field to present their latest results. They will cover the many facets of our field, and will be joined by many more oral and poster contributions to be selected from the abstracts that are submitted. We look forward to seeing you in Bordeaux in 2014!