The main goal of the article is to reveal the importance of preserving the use of native Turkic-speaking languages that are endangered such as Crimean Tatars, Tuvan, Balkars, Kumyks, Karachay, Nogai, Gagauz, Sakha and Khakass in Kazakhstan to pass the linguistic practices to the future generation before these ethnic groups disappear. The war times, the period of Great Famine, Stalin's repressions, deportation, all these events had their toll not only on Kazakhs, but also on all the Turkic peoples in general. The Turkic peoples who inhabited the Kazakh land during those hard times still live in our country. The state language of the Republic of Kazakhstan is the Kazakh language. Despite the fact that Kazakhstan is multi-ethnic, there are no obstacles for representatives of the ethnic minorities as to use their native tongues. These ethnic groups have less representation demographically as a reason their linguistic usage and practice is vulnerable. In this regard, the results of the national population census of 2021 in the Republic of Kazakhstan Statistical collection demonstrates the changes of the ethnic group from 2009 to 2021 (https://stat.gov.kz/national/2021/). The population has changed drastically. The problems of the vulnerable and critically endangered Turkic languages spoken by relevant ethnic minorities in Kazakhstan have been considered in this article.This article provides a general overview of how the oldest family classification affected the endangered Turkic languages in Kazakhstan. Meanwhile, systematic grouping can be started by works of Arat. Arat proposes classifying a group of Turkic languages as “dialects” and “sub-dialects”, using the term “Turkic dialects” for modern Turkic languages from 1947 to 1951. But Arat's own classification of Turkic languages and subsequent classifications have not yet been consistently discussed in a comparative context. The article also provides an overview of the main works of such famous Turkologists as Talat Tekin’s “New classification of Turkic languages”, Benzing’s “Classification of the Turkic Languages” based on Samoilovich's classification and Karl Menges’s “Turkic languages and peoples”.The current state of the Turkic languages, the main problems of the vulnerable and critically endangered Turkic languages spoken by ethnic minorities has been considered in the article and also a socio-linguistic study of the situation in Kazakhstan, being the subject of research, has been conducted. The percentage based indicators and frequency analysis were performed by collecting data during the study using both qualitative and quantitative analytical methods. Hence, a 14 questions questionnaire was prepared with purpose of data gathering on the usage of the language and its application on day today life. The questionnaire was distributed in 2020 to collect data from 150 participants in ethnic groups. The data collected was found to be insufficient thus an alternative research method was applied to process the data. Interviews were conducted to analyze the qualitative aspects of the research. Audio recordings have been made during the interviews and recordings have been analyzed in the article. Regarding the research analyses, a concept has been formulated as to vulnerable and critically endangered Turkic languages spoken by relevant ethnic minorities in Kazakhstan.As a result of the analysis, the article discloses the similarity and differences of endanger Turkic languages in phonetic, morphological, syntactic and semantic terms, determining the level and scope of the use of native languages in Kazakhstan by Turkic ethnic communities.