Phonons and phonon interactions will be the subject of an international summer school, supported by the North Atlantic Treaty Organization, to be held at Aarhus University in Denmark during August 12–24, 1963. The school is intended for students preparing PhD or equivalent theses in solid‐state physics, as well as for physicists and chemists with research experience in related fields. The main topics will be interaction of phonons with phonons, electrons, external radiation, lattice imperfections, and phonons in liquids, with separate sessions to be arranged on microwave phonons and organic semiconductors. The program will include approximately 50 lectures given by 13 scientists active in the field. Attendance at the school will be limited to about 85 participants.