The Unknown Soldier (Finnish: Tuntematon sotilas, Swedish: Okänd soldat) is an independent 2017 Finnish war drama film directed by Aku Louhimies. It is the third film adaption of the 1954 best-selling Finnish classic novel of the same name by Väinö Linna, a book considered part of national legacy, and the first one to be based on its manuscript version, A War Novel (Finnish: Sotaromaani). The previous two film adaptations were released in 1955 and 1985.

Described by critics as gritty, forlorn, honest and realistic, the movie follows a machine gun company of the Finnish Army from a frog perspective during the Continuation War between Finland and the Soviet Union from 1941 to 1944. It is the most expensive film produced in the Finnish language with a budget of 7 million euros.

The film premiered domestically on October 27th, 2017, as a part of the official 100th anniversary of Finnish independence program, breaking the opening weekend record for a local-language film. The international premier was on November 23rd, 2017, at the Tallinn Black Nights Film Festival.