Č. Burdík1, O. Navrátil2, S. Pošta11Department of Mathematics, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Trojanova 13, 12000 Prague, Czech Republic2Department of Applied Mathematics, Faculty of Transportation Sciences, Czech Technical University in Prague, Na Florenci 25, 11000 Prague, Czech RepublicE-mail: cestmir.burdik@fjfi.cvut.czThe XXVI International Conference on Integrable Systems and Quantum Symmetries (ISQS-26), organized by the Department of Mathematics, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University Prague and the Bogoliubov Laboratory of Theoretical Physics of the Joint Institute for Nuclear Research, belongs to the successful series of conferences held at the Czech Technical University which began in 1992 and is devoted to problems of mathematical physics related to the theory of integrable systems, quantum groups and quantum symmetries. During the last 5 years, each of the conferences gathered around 110 scientists from all over the world. 45 papers of plenary lectures and contributions presented at ISQS-26 are published in the present issue of Journal of Physics: Conference Series.