Oscar W. Hagen (March 7, 1884 – September 12, 1945) was a North Dakota Republican Party politician who served as the 20th lieutenant governor of North Dakota from 1941 to 1943 under Governor John Moses.

Hagen previously served in the North Dakota House from 1937 to 1940.North Dakota Blue Book, 1989 He was the Republican nominee for governor in 1942. He died on September 12, 1945.

Biography Hagen was born in 1884 in Richland County, North Dakota.

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