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Kazimierz Siemienowicz (Lithuanian: Kazimieras Simonavičius, Belarusian: Казімер Семяновіч, Kazimir Siemianovič) (born c.1600 - c.1651) was a Polish-Lithuanian szlachcic, he referred himself as Lithuanian nobleman[1], from the Grand Duchy of Lithuania, then part of the Polish-Lithuanian Commonwealth, General of artillery, gunsmith, military engineer, artillery specialist and pioneer of rocketry. His coat of arms was Ostoja. No portrait or detailed biography of him have survived.