This book gathers papers of  the proceedings of the 15th Asia Pacific Physics Conference (APPC15) which is organized by the Association of Asia Pacific Physical Societies (AAPPS), and the conference was held almost on-line from 21 to 26 August 2022 and partly both on-line and on-site in Seoul, Korea. And this proceedings mainly covers all the fields in physics such as Applied Physics, Astrophysics, Cosmology, Gravitation, Atomic and Molecular Physics, Condensed Matter Physics, Nuclear Physics, Particles and Fields, Physics Education, Plasma Physics, and Statistical Physics. The main target of this proceedings is the physicists who would like to learn the recent research trends, particularly, the physics society members who have rather difficulties to attend many conferences due to limited research grants. And especially it can be a good introduction/reference to graduates and post-doc level researchers.  
