Not to be confused with the Duchy of Silesia.

Austrian Silesia (; ; ), officially the Duchy of Upper and Lower Silesia (; ), was an autonomous region of the Kingdom of Bohemia and the Austrian Empire, from 1867 a Cisleithanian crown land of Austria-Hungary. It is largely coterminous with the present-day region of Czech Silesia, and was, historically, part of the larger Silesia region.

Czech Silesia (; ; ; ) is the name given to that part of the historical region of Silesia presently located in the Czech Republic. While not today an administrative entity in itself, Czech Silesia is, together with Bohemia and Moravia, one of the three historical Czech lands.