Arnfinn Vik (20 May 1901 – 13 September 1990) was a Norwegian politician who served as Mayor of Oslo.

He participated in the Left Communist Youth League's military strike action of 1924.

He was convicted for assisting in this crime and sentenced to 4 months of prison.

After the end of World War II, he served as mayor of Oslo from 1945 to 1947.

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