The Armed Forces of the Republic of Poland, Also called the Polish Armed Forces And popularly called Wojsko Polskie in Poland are the national armed forces of the Republic of Poland. The name has been used since the early 19th century, but can also be applied to earlier periods. The Polish Legions and the Blue Army, composed of Polish volunteers from America and those who switched sides from the Central Powers, were formed during World War I. In the war's aftermath, the Polish Army was reformed from the remnants of the partitioning powers' forces and expanded significantly during the Polish–Soviet War of 1920.

The Polish–Soviet War was fought primarily between the Second Polish Republic and the Russian Soviet Federative Socialist Republic before it became a union republic in the aftermath of World War I and the Russian Revolution, on territories which were previously held by the Russian Empire and the Habsburg Monarchy following the Partitions of Poland.