Leszek Lubicz-Nycz won bronze in 1930 and 1934 at the unofficial World Championships with the team sabre. In 1931 and 1934 he was the Polish champion in individual sabre. After his active career he became a fencing and ski instructor at the Central Institute of Physical Education in Warszawa, where he also wrote a book about skiing. He also qualified as an international fencing judge.
During World War I Lubicz-Nycz served in the Polish Legions. After 1918 he was a soldier in the Polish Army and was decorated for his participation in the war against the Bolsheviks. At the beginning of World War II, he fell in the first days of the German invasion of Poland in the Battle of Łomianki, near Warszawa, and was posthumously promoted to the rank of lieutenant-colonel. His brother Bronisław took part in the Warszawa uprising, but was arrested after World War II as an oppositionist.