The flag of the Duchy of Teschen (Polish: Księstwo Cieszyńskie; Czech: Těšínské knížectví) was established in 2016 through the initiative of regional history enthusiasts in cooperation with the prominent Polish heraldic and vexillologist Alfred Znamierowski. The flag refers to the coat of arms and the historical banners of the Duchy of Teschen. The modern flag is an expression of respect for the history and tradition of the Duchy of Teschen, and also part of the different identities of the present inhabitants of the Cieszyn Silesia towards Lower and Upper Silesia.