The international conference "Linguistic Forum 2021: Language policy and language preservation" will be held at the Institute of Linguistics, RAS, on November 11-13, 2021. The conference is part of a series of annual linguistic forums initiated by the Institute of Linguistics RAS in 2019, each dedicated to a socially important aspect of the scientific study of language. The 2019 forum took as its topic the UN Year of Indigenous Languages. The 2020 forum "Language and Artificial Intelligence" was devoted to interdisciplinary dialogue among researchers working at the interface of linguistics and computer science. The topic of the 2021 forum is suggested by the growing attention of society and governments to language policy and particularly to the problem of language preservation. The starting point of the 2021 forum is the International Decade of Indigenous languages, announced by the UN for 2022-2032, as well as the Program for the preservation and revitalization of the languages of Russia, proposed by the Institute of Linguistics in connection with the International Decade.