International Conference 2021 (QUALICO 2021) was held online from September 9 to 11 2021. The conference was supported by The International Quantitative Linguistics Association (IQLA), National Institute for Japanese Language and Linguistics (NINJAL), and Center for Corpus Development, NINJAL. It was originally planned to be held in September 2020 and then was postponed for a year because of COVID-19. It was the first conference hosted in Asia and also the first one held online for QUALICO. Two keynote lecturers were invited, and 39 papers as talks and 20 papers for a poster session were presented. Of 117 participants, 71 were presenters, and 44 were students. Participants joined from 26 countries and regions, i.e., EU counties, Russia, Canada, U.S.A., the Republic of South Africa, China, Taiwan, and Japan. Many papers focused on classical or fundamental topics such as linguistics laws, e.g., Zipf" law, Menzerath-Altmann" law, Synergetic Linguistics, or valency theory. Other papers also focused on the applied topics like the authorship attribution, comparative language studies, or studies using corpora. IQLA Council Business Meeting was also held, and new board members were selected. The next conference is planned to be organized in Europe in 2023 or 2024. A call for papers for the next conference will be announced on the IQLA website.