The Helmholtz International Summer School “Dense Matter 2015” organized in the framework of the program DIAS-TH was opened on Mondaye, 29 June 2015 in the by the Bogoliubov Laboratory of Theoretical Physics of JINR. About 60 students, postgraduate and young scientists from Armenia, Belgium, Vietnam, Egypt, India, Germany, Norway, Poland, Russia, Serbia, Slovakia, Ukraine, Uzbekistan, South Africa will listen to lectures of  leading theoretical physicists of the world for the whole week. The school will continue its work in VBLHEP where participants and lecturers will be able to participate in the International Meeting «Strageness in Quark Matter» which will be opened on July 6.