------------------------------------------------------------------------ Call for Papers 9th Annual International Conference on Applied Category Theory (ACT2026) July 6 - July 10, 2026 Tallinn, Estonia https://actconf2026.github.io ------------------------------------------------------------------------ The 9th International Conference on Applied Category Theory will take place at the Estonian Maritime Academy of Tallinn University of Technology, Tallinn, Estonia from 6 - 10 July. The conference will be preceded by the Adjoint School Research Week from June 29 - July 3, 2026. This conference follows previous events at Florida (2025), Oxford (2024), Maryland (2023), Strathclyde (2022), Cambridge (2021), MIT (2020), Oxford (2019) and Leiden (2018). Applied category theory is important to a growing community of researchers who study computer science, logic, engineering, physics, biology, chemistry, social science, systems, linguistics and other subjects using category-theoretic tools. The background and experience of our members is as varied as the systems being studied. The goal of the Applied Category Theory conference series is to bring researchers together, strengthen the applied category theory community, disseminate the latest results, and facilitate further development of the field. SUBMISSIONS We accept submissions in English in the following three tracks: 1. Research 2. Software demonstrations 3. Teaching and communication Detailed Call for Papers is available at https://actconf2026.github.io/cfp.html Extended abstracts and conference papers should be prepared with LaTeX. For conference papers please use the EPTCS style files available at >. The submission link is https://easychair.org/my/conference?conf=act2026. Reviewing is single-blind, and we are not making public the reviews, reviewer names, the discussions nor the list of under-review submissions. This is the same as previous instances of ACT. IMPORTANT DATES The following dates are all in 2026, and Anywhere On Earth. - Abstracts Due : Wednesday 23 March - Full papers Due : Friday 30 March - Authors notification : 11 May - Adjoint school research week: 29 June - 3 July - Camera-ready version due : TBA - Conference begins : 6 July ORGANIZING COMMITTEE Geoff Cruttwell, Mt. Allison University, Canada (PC co-Chair) Paweł Sobociński, Tallinn University of Technology (General Chair) Priyaa Varshinee Srinivasan, Tallinn University of Technology (Organizing co-Chair, PC co-Chair) Kristi Ainen, Tallinn University of Technology (Organizing co-Chair) Sofiya Taskova, Tallinn University of Technology (Sponsorship Chair) STEERING COMMITTEE John Baez, University of California, Riverside & University of Edinburgh, U.K. Bob Coecke, University of Oxford, U.K. Michael Johnson, MacQuarie University Simona Paoli, University of Aberdeen, U.K. Dorette Pronk, Dalhousie University, Canada. David Spivak, Topos Institute, U.S.A. PROGRAM COMMITTEE Alexis Toumi, Planting Space Bryce Clarke, Tallinn University of Technology Barbara König, University of Duisburg-Essen Bojana Femic, Serbian Academy of Sciences and Arts Chris Heunen, The University of Edinburgh Daniel Cicala, Southern Connecticut State University Dusko Pavlovic, University of Hawaii Evan Patterson, Topos Institute Fosco Loregian, Tallinn University of Technology Gabriele Lobbia, Università di Bologna Georgios Bakirtzis, Institut Polytechnique de Paris Jade Master, University of Strathclyde James Fairbanks, University of Florida Jonathan Gallagher, Hummingbird Biosciences Joe Moeller, Caltech Jules Hedges, University of Strathclyde Julie Bergner, University of Virginia Kohei Kishida, University of Illinois, Urbana-Champaign Maria Manuel Clementino, CMUC, Universidade de Coimbra Mario Román, University of Oxford Marti Karvonen, University College London Martina Rovelli, UMass Amherst Masahito Hasegawa, Kyoto University Matteo Capucci, University of Strathclyde Michael Shulman, University of San Diego Nick Gurski, Case Western Reserve University Niels Voorneveld, Cybernetica Paolo Perrone, University of Oxford Peter Selinger, Dalhousie University Paul Wilson, University of Southampton Robin Cockett, University of Calgary Robin Piedeleu, University College London Rory Lucyshyn-Wright, Brandon University Rose Kudzman-Blais, University of Ottawa Ryan Wisnesky, Conexus AI Sam Staton, University of Oxford Shin-Ya Katsumata, Kyoto Sangyo University Simon Willerton, University of Sheffield Spencer Breiner, National Institute of Standards and Technology Tai Danae Bradley, SandboxAQ Titouan Carette, École polytechnique Tom Leinster, The University of Edinburgh Walter Tholen, York University Teaching & Communication sub-committee Selma Dündar-Coecke, University College London, Institute of Education Ted Theodosopoulos, Nueva School Tai Danae Bradley, SandboxAQ We look forward to your participation in the conference! 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