Iron Wolf (Lithuanian: Geležinis Vilkas) was a semi-official Lithuanian militarized organization active in 1928–1930 and led by Prime Minister Augustinas Voldemaras. Established at the end of 1927 by the ruling Lithuanian Nationalist Union to help suppress its opposition, it was inspired by the Blackshirts, an Italian fascist organization. The organization was secret; it was officially active as a sports union from May 1928. The organization spied on its political opponents, engaged in limited physical coercion, and launched propaganda initiatives. It had more than 4,000 members.