Opoczno S.A. or ZPC Opoczno, known in Polish as the Zespół Zakładów Płytek Ceramicznych Opoczno, is the largest producer of ceramic tiles in Poland. For almost half a century the foundry enjoyed a monopoly status in the local market. Established in the town of Opoczno originally in the mid 19th century, it became the first and largest ceramic tiles manufacturer already in Congress Poland under the Russian partition.