Polish Military Organization of the Upper Silesia () was a secret military organization formed in February 1919 in Upper Silesia. It was involved in the three Silesian Uprisings, although officially it was disbanded after the Second Uprising. It had over 20,000 members, including Alfons Zgrzebniok, Jan Wyglenda, Walenty Fojkis, Karol Grzesik, Rudolf Kornke, Wolfgang Kornke, Maksymilian Iksal.