en تخصصي Special پژوهشي Research <div style="text-align: justify;"><span style="font-size:11pt"><span style="line-height:115%"><span style="font-family:Calibri,sans-serif"><span new="" roman="" style="font-family:" times="">Endangerment of diversity is among the great problems of modern era, deterioration of linguistic diversity of the world being among its clear illustrations. This study is based on this idea that causes of deterioration of biodiversity and sociolinguistic diversity are similar, not to say being the same. Therefore, after explanting the &ldquo;introduction&rdquo;, &ldquo;review of the literature&rdquo; and &ldquo;theoretical base of the research&rdquo;, we have focused on Iran&rsquo;s endangered languages, to present some suggestions seeming to be suitable for increasing the vitality of these endangered languages. This study underlines the importance of the size of a speech community, the declining prestige of the language, and the decrease of the usual functions of it as the main factors leading to the endangerment and ultimate demise of a language. As a result, increasing the solidarity of a speech community, maintaining the usual functions of endangered languages, and promoting their prestige among their speakers are among the ways mentioned for preserving such languages and dialects of Iran</span><span style="font-size:12.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">.</span></span></span></span></span></span></div> Endangered languages, Speech community, Linguistic prestige, Globalization, Iran, Linguistic diversity 105 120 http://cals.gonbad.ac.ir/browse.php?a_code=A-10-32-1&slc_lang=en&sid=1 Reza Amini iranamini@msn.com 1003194753284600163 1003194753284600163 Yes <b> Reza Amini (Corresponding Author),</b> Assistant Professor of Linguistics, Research Center for Cultural Heritage and Tourism, Tehran, Iran. Email: r.amini@richt.ir