Leon Billewicz (1870–1940) was a Polish officer and a General of the Polish Army. Initially serving with the Imperial Russian Army, in November 1918 he joined the Polish forces. In the Polish-Bolshevik War of 1919-1920 he commanded the Polish 13th Infantry Brigade. In 1919 he was promoted to the rank of generał brygady. After the Peace of Riga he remained in active service and, until 1927, served as a commanding officer of the Brześć Fortified Area. In April 1927, he retired from active service due to old age. However, after the Invasion of Poland in 1939 he was arrested by the NKVD and imprisoned in Soviet Union. Interned in the Starobielsk concentration camp, he was murdered in Kharkov in April 1940, at the age of seventy, during the Katyń massacre.