Osku is a Finnish masculine given name. It is a pet form of Oskari and thus a variant of the name Oscar. It may refer to:
Osku Heinonen (born 1992), Finnish basketball player Osku Kuutamo, Finnish 21st century male wheelchair curler and curling coach Osku Maukonen (born 2007), Finnish football goalkeeper Osku Nurmi, Finnish radio personality Osku Palermaa (born 1983), Finnish ten-pin bowler Osku Torro (born 1979), Finnish high jumper