The international conference Hydrogen Days 2019 represents a well-established event in the field of hydrogen technologies. And it gives me great pleasure to invite you to its 10^th anniversary edition. In contrast to traditional conferences, it combines a technical symposium, providing details of the latest research results, with an overview of advances in the industrial sector and trends in national as well as European policy. This specific format of the meeting reflects the position of the Czech Republic as well as other Central and Eastern European countries with regard to hydrogen technologies which are still predominantly known to only a relatively narrow group of specialists.