Dear Colleagues, We are pleased to invite you to submit a contribution to the *19th Conference of the* *International Federation of Classification Societies (IFCS 2026)*, which will take place at the University of Milano-Bicocca and the University of Milan in *Milan* on *July 14-16, 2026*. The conference website is available at https://ifcs2026.unimib.it/. *Conference Topics* The conference aims to promote interactions among scholars and professionals across different fields, including classification and clustering, complex data analysis, network and spatio-temporal methodologies, machine learning and deep learning techniques. *Keynote Speakers* - Krzysztof Jajuga (Wrocław University of Economics and Business) - Laura Sangalli (Politecnico di Milano) - Brendan Murphy (University College Dublin) - Mohamed Nadif (Université Paris Cité) *Important Dates* - Pre-conference *proceedings* (Springer Volume with peer review): - Deadline: January 18, 2026 - Notification of acceptance: March 1, 2026 - Deadline for the revised version: March 15, 2026 - Pre-conference *abstracts*: - Deadline: March 15, 2026 - Notification of acceptance: March 31, 2026 *Submission Guidelines for Proceedings* Authors are invited to submit a short paper (6-8 pages) following the Springer template. Accepted papers, after peer review, will be published in an open-access eBook in the Springer Series "Studies in Classification, Data Analysis, and Knowledge Organization". More details can be found at https://ifcs2026.unimib.it/publications-2/ <https://ifcs2026.unimib.it/publications-2/>. *Special issues* We are also planning to publish Special Issues in collaboration with prominent international journals. Details will be available soon at https://ifcs2026.unimib.it/publications-2/ <https://ifcs2026.unimib.it/publications-2/>. *Awards* IFCS provides scientific awards to graduate students, postdoctoral fellows, and young and senior researchers, who will be awarded during the conference. More details are available at https://ifcs2026.unimib.it/awards/ . We look forward to receiving your contributions and welcoming you to Milan. Best regards, The Local Organizing Committee of IFCS 2026 *Francesca Greselin, Luca Brusa, Andrea Cappozzo, Alessandro Casa, Francesca De Battisti, Francesco Denti, Sónia Dias, Andrea Marletta, Marta Nai Ruscone, Giorgia Zaccaria, Mariangela Zenga* Dr. Giorgia Zaccaria, Ph.D. Postdoctoral Research Fellow University of Milano-Bicocca Personal pages: Giorgia Zaccaria Personal page <https://giorgiazaccaria.github.io/> - Giorgia Zaccaria ResearchGate <https://www.researchgate.net/profile/Giorgia-Zaccaria> - Giorgia Zaccaria - Google Scholar <https://scholar.google.it/citations?user=svSITAkAAAAJ&hl=it>