• THESEUS CONFERENCE 2026, Torremolinos (Spain),  24-26 March 2026 (Abstract deadline: 31/01/2026)
• The X-ray Universe 2026, Elche (Spain), 8-11 June 2026 (Abstract deadline: 20/02/2026).
• Galactic Frontiers 2026: Advancing X-ray Astronomy in a Multiwavelength Universe, Bad Honnef (Germany), 15-18 June 2026 (Abstract deadline: 31/03/2026)
• High Energy Astrophysics and Cosmology in the era of all-sky surveys, Yerevan (Armenia), 15-16 June 2026 (Abstract deadline: 11/03/2026)
• European Astronomical Society Annual Meeting, Lausanne (Switzerland), 29 June – 3 July 2026.
• Space Telescopes and Instrumentation 2026: Ultraviolet to Gamma Ray,  Copenhagen (Denmark), 5–10 July 2026 (Abstract deadline: 17/06/2026)
• AGN Feedback across all scales and time, Garching (Germany), 6-10 July 2026 (Abstract deadline: 15/01/2026)
• Tidal Disruption Events and Nuclear Transients in Crete vol. 2, Heraklion (Crete, Greece), 24-28 August 2026.

Notice that this list is not meant to be all-inclusive. Updates, corrections, or meeting suggestions should be sent to the ACO.