The Polish minority in the Czech Republic is a Polish national minority living mainly in the Trans-Olza region of western Cieszyn Silesia. The Polish community is the only national minority in the Czech Republic that is linked to a specific geographical area. Trans-Olza is located in the north-eastern part of the country. It comprises Karviná District and the eastern part of Frýdek-Místek District. Many Poles living in other regions of the Czech Republic have roots in Trans-Olza as well.

Trans-Olza, also known as Trans-Olza Silesia, is a territory in the Czech Republic, which was disputed between Poland and Czechoslovakia during the Interwar Period. Its name comes from the Olza River.