3D GeoInfo & SDSC 2025, the co-located conference of the 20th International 3D GeoInfo Conference 2025 and the 9th International Smart Data and Smart Cities Conference, will be held in Kashiwa, Japan on 02-05 September 2025. The conference is hosted by the Center for Spatial Information Science (CSIS), the University of Tokyo and the Ministry of Land, Infrastructure, Transport and Tourism (MLIT).