The International Conference on Theoretical and Applied Physics is a conference organized by Physical Society of Indonesia (PSI) in collaboration with respectfull universities and research insitutes across Indonesia. It is an annual conference of the Society and moves from one major city to another, started twelve years back in Bandung (Capital city of West Java province), then consecutively moved to Palangkaraya (Central Kalimantan, 2012), Malang (East Java, 2013), Denpasar (Bali, 2014), Kendari (South-East Sulawesi, 2015), Makasar (South Sulawesi, 2016). Yogyakarta (Central Java, 2017), Medan (2018), and Lampung (2019). The ICTAP 2020 will be held in Mataram, Lombok, Nusa Tenggara Barat, on 25th-27th September 2020. ICTAP is aimed for promoting, developing, and disseminating interdisciplinary research from many different fields of physics. Researchers from universities, institutes, and related industries, working on various fields of physics are invited to participate to present papers or just as a participant.