Dag Jostein Fjærvoll (20 January 1947 – 5 February 2021) was a Norwegian politician. He was a member of the Christian Democratic Party. He was Minister of Defence from 1997 to 1999 and Minister of Transport and Communications from 1999 to 2000 in the Kjell Magne Bondevik cabinet. He was also a member of Storting from 1985 to 1997. Fjærvoll was born in Hadsel, Norway.