Dear EPSA members, We are pleased to invite paper submissions on the Research Topic *“Regionalism in the Age of Polycrisis”* to be published with the journal *Frontiers in Political Science*. The Research Topic aims to explore the effects of the current context of ‘polycrisis’ on regionalism from a pluralistic and global perspective, going beyond the most studied experiences of the Global North. Original research articles covering different policy areas and world regions, from all sub-fields of international studies, are welcome. More information: https://www.frontiersin.org/researchtopic/69565 Frontiers in Political Science <https://www.frontiersin.org/journals/political-science> is a peer-reviewed open access academic journal indexed in the DOAJ, Scopus and Web of Science (ESCI), with an Impact Factor of 2.3. The Research Topic will be hosted in the International Studies section of the journal, with the support of Chief Editors Dr. Kilian Spandler (University of Keil) and Dr. Frank Mattheis (United Nations University, UNU-CRIS). *Co-Editors:* Dr. António Raimundo (University of Minho), Prof. Dina Sebastião (University of Coimbra) and Dr. Bruno Theodoro Luciano (Université libre de Bruxelles). *Submission deadlines:* Manuscript summaries: 21 April 2025 Full manuscripts: 9 August 2025 *Submission guidelines:* Papers should be submitted through this link <https://www.frontiersin.org/researchtopic/69565> and following the author guidelines available here <https://www.frontiersin.org/about/author-guidelines#Templates>. *Publishing solutions:* Manuscripts accepted for publication are subject to publishing fees. However, the journal offers institutional arrangements and a fee support scheme: https://www.frontiersin.org/journals/political-science/for-authors/publishing-fees