Østen Østensen (12 August 1878 – 22 December 1939) was a Norwegian rifle shooter competing in the early 20th century.

His first medal was a silver medal in team, free rifle at the 1912 Summer Olympics in Stockholm.

At the 1920 Summer Olympics in Antwerp, he won silver medals for team, free rifle and team, military rifle, 300 + 600 m, and bronze medals in free rifle, three positions, and team, small bore rifle.

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