April 23-24, 2026
University of Warwick
https://qcow.cs.ox.ac.uk/

QCOW is a new series of meetings dedicated to advancing the understanding of fundamental questions and open problems in quantum complexity theory. The meetings will rotate between universities of Cambridge, Oxford, and Warwick, with each event focusing on a specific theme within the theoretical foundations of quantum computation. The aim is to foster a sustained exchange of ideas among researchers in the field—bringing together leading experts, academics and postdoctoral scholars, and students who share a deep interest in the rigorous study of quantum computational power and its limitations. By providing a forum for in-depth discussion and collaboration, the QCOW Colloquium seeks to strengthen and expand the community of researchers working on quantum computing theory, stimulate new research directions, and inspire the next generation of scientists in this rapidly evolving discipline. The topic of QCOW2 will be Quantum Learning Theory.

June 2-5, 2026
University of Copenhagen
https://sites.google.com/view/wact2026/

Registration deadline: February 28, 2026

Algebraic Complexity Theory investigates the computational complexity of algebraic problems, focusing on arithmetic circuits, polynomial computation, and algebraic models of computation. The goal of this workshop is to present recent advances in the field of algebraic complexity and to highlight the deep underlying connections to other areas of theoretical computer science. Registration for this workshop is free but mandatory.

July 6-10, 2026
Okinawa, Japan
https://www.oist.jp/conference/information-theory-modern-science

Submission deadline: May 17, 2026
Registration deadline: June 15, 2026

We are excited to announce the opening of registration for the Information Theory in Modern Science (ITMS) Workshop, hosted at the Okinawa Institute of Science and Technology (OIST), Japan

This workshop brings together researchers from information theory, probability, statistics, machine learning, and the natural sciences, focusing on how information-theoretic ideas are shaping modern scientific questions.

June 22-26, 2026
Salt Lake City, Utah, USA
https://acm-stoc.org/stoc2026/callforworkshops.html

Submission deadline: March 6, 2026

TheoryFest 2026 will hold workshops during the STOC 2026 conference week, June 22–26, 2026. We invite groups of interested researchers to submit workshop proposals.

December 11-12, 2025
Oxford, UK
https://qcow.cs.ox.ac.uk/

Submission deadline: December 10, 2025
Registration deadline: December 10, 2025

The first Quantum Cambridge-Oxford-Warwick Colloquium (QCOW), taking place 11–12 December 2025 at the University of Oxford. This inaugural meeting focuses on Quantum Low-Depth Complexity. The programme features talks, tutorials, and opportunities for open discussion.

December 18-19, 2025
Sydney, Australia
https://sites.google.com/view/tao25workshop/home

Registration deadline: December 1, 2025

This is a free 2-day workshop, right after FOCS 2025, to discuss recent advances in approximation and online algorithms for network design and related areas. This is the 10th iteration of the Flexible Network Design workshop series. The workshop will have a mix of talks—including plenary talks by MohammadTaghi Hajiaghayi on beating 2-approximation for Steiner forest, and Jarek Byrka on recent advances on bidirected cut relaxations—as well as a Wiki Edit-a-thon and an Open Problem Session.

Students, faculty, and researchers of all seniority levels are welcome.

October 10, 2025
Copenhagen, Denmark
https://barc.ku.dk/wave-conference/

Registration deadline: October 2, 2025

The WAVE (Women in Algorithms, Venture into Exploration) workshop will be held at the University of Copenhagen on October 10th, 2025. The event features technical talks and personal reflections in Theoretical Computer Science (TCS), presented by outstanding female researchers, as a way to celebrate the 150th anniversary of women’s access to the University of Copenhagen. The event will also include a panel discussion on current challenges in TCS, with a special emphasis on the difficulties faced by early-career female researchers and diversity issues. International attendees are warmly welcomed. Participants of all genders are encouraged to attend, as all topics discussed are relevant to everyone in the field.

October 10-12, 2025
Pittsburgh, PA
https://sites.google.com/andrew.cmu.edu/acorn-2025/home

Carnegie Mellon University will be hosting the 2025 ACORN (Algorithms, Combinatorics, and Optimization Research Network) Workshop, October 10-12, 2025. Registration is now open at the website here: https://sites.google.com/andrew.cmu.edu/acorn-2025/home

ACORN (Algorithms, Combinatorics, and Optimization Research Network) is a group of institutions, departments, and researchers committed to the principle that the fields of combinatorics, optimization, and algorithms share core ideas and methods and that their different perspectives bring new ideas, questions, and techniques to the other fields. Following in the footsteps of previous “Watermellon” workshops organized by CMU and Waterloo, the first ACORN meeting was jointly organized by the three schools with joint ACO PhD programs (Georgia Tech, CMU, and Waterloo) and was held at Georgia Tech in March 2023. See https://sites.gatech.edu/acorn/

October 11-12, 2025
Rochester, NY
https://www.cs.rochester.edu/u/shossei2/eagl2025website/index.html

Registration deadline: September 20, 2025

The purpose of this annual workshop is to bring together researchers in theoretical computer science, who work in the vicinity of the eastern great lakes region. For 2025, this event is held at the University of Rochester, NY, USA.

December 11-13, 2025
University of Sydney, Australia
https://sites.google.com/view/celebration-tcs-2025/

Registration deadline: December 1, 2025

This (free) mentoring and research event will take place at the University of Sydney, just before FOCS 2025, to celebrate the richness and collegiality of the Theoretical Computer Science community. This event, co-organized with TCS For All, will feature a mix of inspirational and rising star talks, a poster session, and plenty of time for discussions and socializing with other members of the TCS community.

Students, faculty, and researchers of all seniority levels are welcome. Applications for travel support (accommodation) are due by September 19.