From the Standard Model of particle physics to concordance cosmology, the most compelling theories that deepen our understanding of the universe converge within the framework of the dark sector. The 20th Patras Workshop on Axions, WIMPs, and WISPs, hosted by the Instituto de Astrofísica de Canarias (IAC) in Tenerife, Spain, from September 22–26, 2025, will bring together today’s esteemed experts and the next wave of young thinkers to push the boundaries of the field. As the latest chapter in a prestigious series that began at CERN in 2005, the workshop will delve into groundbreaking theoretical advances, direct and indirect probes of dark matter and dark energy, and frontier work to unveil weakly interacting particles, advancing our understanding of their properties. This year, emphasis will be placed on astrophysical insights into the dark sector, drawing on the IAC’s rich scientific environment, home to the reference astronomical observatories in the Northern Hemisphere.

Local organizing comittee:

Javier De Miguel (Chair, Instituto de Astrofísica de Canarias)
Arianna Di Cintio (Co-Chair & Ombudsperson, University of La Laguna)
J. Alberto Rubiño-Martín (Co-Chair, Instituto de Astrofísica de Canarias)

International organizing committee:

Javier De Miguel (Chair, Instituto de Astrofísica de Canarias)
Laura Baudis (University of Zurich)
Dmitry Budker (Helmholtz Institute and Johannes Gutenberg University Mainz)
Giovanni Cantatore (University and INFN Trieste)
Horst Fischer (University of Freiburg)
Joerg Jaeckel (University of Heidelberg)
Marin Karuza (University of Rijeka and INFN Trieste)
Axel Lindner (DESY)
Marc Schumann (University of Freiburg)
Yannis Semertzidis (KAIST)
Arne Wickenbrock (Helmholtz Institute and Johannes Gutenberg University Mainz),
Konstantin Zioutas (University of Patras).