The 28th General Assembly of the International Union of Geodesy and Geophysics will be held 11-20 July 2023 at the Messe Berlin – City Cube, Berlin, Germany. This is a special opportunity for participants from around the world to come together and discuss the full range of geodetic and geophysical themes and further enhance the important interdisciplinary collaboration for a better understanding of the earth system. Scientific activities will include special public lectures, keynote union lectures, and a wide variety of themed sessions.