Kazimierz Fabrycy was born on March 3, 1888 in Odessa. Upon graduating from school in Niemirów he enrolled for a year-long military service in the Russian army. He followed this with enrollment at Polytechnic School of Lviv and then later at the Technical University of Munich. From this latter institution he was conferred a degree in engineering. Even as a student Kazimierz flung himself into activities of the Polish independence movement. Between 1908 and 1910 he co-founded first the Union of Armed Struggle and then the Rifle Association.