The Flag of Petseri County is a symbolic representation of the administrative division of Estonia known as Petseri County. Adopted during the interwar period (1920-1940), this flag features three horizontal stripes in the colors blue, white, and black from top to bottom. The flag does not currently hold official status due to Estonia being reorganized into smaller counties after World War II. However, it remains significant as a historical emblem of Petseri County.