Jakob Modalsli (1 April 1911 – 31 January 1984) was a Norwegian civil servant.
He was born in Strømm, and graduated from the Norwegian College of Agriculture in 1936.
In 1947, he was hired as secretary general of the Norwegian Agrarian Association; in 1949 he became director of the Direktoratet for eksport- og importregulering.
From 1952 to 1960 and 1962 to 1966 he was the permanent under-secretary of state in the Ministry of Defence.
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