The Conferences on Supersymmetry and Unification of Fundamental Interactions (SUSY) are amongst the world's largest international gatherings of particle physicists focused on new ideas related to fundamental interactions of elementary particles. The aim of the SUSY conference is to review and discuss recent research in theoretical, phenomenological, astrophysical and experimental aspects of supersymmetric theories and all other approaches to physics beyond the Standard Model. The 30th International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY-2023) is organised by the University of Southampton, United Kingdom. There will be a pre-SUSY-2023 school, taking place in the previous week.