Polish Legion in Finland (Legion Polski w Finlandii) was a military unit comprising ethnic Poles who had been soldiers of the Russian Imperial Army in World War I. Created on April 24, 1917, in Viipuri, it existed until March 1, 1918. It comprised infantry battalion in Viipuri and infantry company in Ino and heavy artillery battery in Sveaborg. At its peak, the Legion comprised 37 officers, 1,700 soldiers and was commanded by Captain Stanisław Bogusławski.
The Legion, based in Viipuri, as well as other Finnish towns, such as Helsinki, Ina, Lappeenranta, Tampere, Vaasa, Turku, Oulu, Tornio, Hämeenlinna, Kokemäki, Rauma, Panelia (Kiukainen), Riihimäki, Kotka, Mikkeli, Pori and Hanko, was subordinate to the Government of Finland, and took part in fighting with the Red Army troops, capturing a lot of equipment, which was handed to the Finnish Army.