Karl Fritjof Lager (born October 1, 1905, Berga, Kronobergs län, died February 22, 1973[citation needed]) was a Swedish communist politician.

Lager was born to a peasant family in Småland.

He held various editorial positions in the communist press.

Lager represented the Communist Party in the city council of Stockholm 1946–1950.

This article about a Swedish politician is a stub.