Following the success of the first conference held in Sendai, Japan, during April 2014, and the second conference held in Chengdu, China, during October 2017, the Japan Society of Computational Engineering and Science (JSCES) and the Japan Association for Computational Mechanics (JACM) will jointly host the 3rd International Conference on Computational Engineering and Science for Safety and Environmental Problems (COMPSAFE2020) which will be held during March 8-11, 2020, in Kobe, Japan. This conference series is an APACM Thematic Conference and an IACM Special Interest Conference, aimed to bring together researchers and scientists from all over the world, who fight daily in the field of disaster prevention and mitigation, structural and material failure, safety and security maintenance, and so on. Other main topics of the conference include, but are not limited to: computational mechanics, computational engineering and science technologies, and their applications related to (1) safety- / risk-related, disaster-preventing topics including various types of natural hazards such as earthquake, tsunami, typhoon / hurricane / cyclone, flood, explosion of volcano, land slide, (2) any kinds of accidents and failures of engineering artifacts such as fractures, crashes, explosion, and (3) environmental and social problems such as air / water pollution, material failures, radioactive contamination, global environment problems, evacuation and so on. We hope this conference will play a role of creating networks between academia and industries and push forward the technologies in those fields.