Arzgirsky District () is an administrative district (raion), one of the twenty-six in Stavropol Krai, Russia. Municipally, it is incorporated as Arzgirsky Municipal District. It is located in the northeast of the krai. The area of the district is . Its administrative center is the rural locality (a selo) of Arzgir. Population: 28,733 (2002 Census); 29,236 (1989 Census). The population of Arzgir accounts for 56.0% of the district's total population.