Field research of local dialects in Mongolia intensified during 1955-1970s and consequently several works on the classification of local dialects were published. When these works were analyzed, some local dialects were classified into Buryat, Oirat or Khalkha groups based on ethnic origins of the speakers due to lack of sufficient source data. This was undoubtedly a significant result to some extent at that time. However, language evolves in accordance with social, historical and political circumstances. Therefore the Buryat dialect of Khuvsgul was selected as the research subject due its scarce documentation and the need for accurate classification. As a result of this research, the following conclusions were made. The local dialect of the Buryat ethnic people of Khuvsgul is: 1. a Khalkhized Buryat dialect or a Khalkha dialect with Buryat root 2. is an endangered language as it assimilated to Khalkha dialect and should be considered part of Khalkha dialect group 3. a real-world example of the influence a country’s official script and its main dialect has on local dialects. Moreover, depending on their geographical location, there are other dialects that have become Khalkhized and Oiratized. There is a need for contemporary analysis and re-classification of Mongolia’s local dialects.