Preface at 13th CRIS-MAC 2024 Cosmic-Ray International Studies and Multi-messenger Astroparticle Conference

This issue of the Journal of Physics: Conference Series features a selection of papers presented at the 13th edition of the CRIS-MAC conference, which focused on fundamental topics in astroparticle physics, with a particular emphasis on multi-messenger astronomy. The conference marked a shift in identity, reflected in the new acronym: CRIS-MAC (Cosmic-Ray International Studies and Multi-messenger Astroparticle Conference), while preserving the original numbering of the CRIS series. This change underscores the conference’s growing emphasis on multi-messenger approaches to astroparticle physics. The scientific programme covered a wide range of interconnected topics—including cosmic rays, gamma-ray and multi-wavelength astronomy, astrophysical neutrinos, and gravitational waves—highlighting the increasingly important role of multi-messenger observations in this field.