After two years of online meetings, the Group Decisions and Negotiation conference organized by GDN-INFORMS returns in its enhanced hybrid form. It will be hosted this year by the University of Tokyo. For the convenience of all participants, apart from onsite presentations, online ones will also be accepted. We kindly invite researchers, practitioners, and all interested in the GDN field to participate in this event. In particular, we invite to submit manuscripts to the stream "Preference modeling and decision support in GDN", organized by prof. Danielle Moraise (Federal University of Pernambuco, Recife, Brazil) and prof. Tomasz Wachowicz (University of Economics in Katowice, Poland). More information about the conference and important dates can be found at the conference's official website: http://gdnconference.org/gdn2023/