Aku-Heikki Ilmari Hirviniemi (born 5 December 1983, in Riihimäki) is a Finnish actor. He is well-known for his role as Urho Hietanen in the 2017 war film The Unknown Soldier. In the spring of 2010, Hirviniemi became a household name in Finland when a weekly sketch comedy television show Putous premiered. From 2012 to 2016 Hirviniemi starred MTV3's police drama series Roba.