Dag Terje Andersen (born 27 May 1957 in Frogn, Akershus) is a Norwegian politician for the Norwegian Labour Party. In addition to professional politics he has worked at a steel mill and as a lumberjack, something that has given him a reputation for politically representing the average citizen.
Andersen was the mayor of Lardal from 1987 to 1992. He was at first a political advisor at the Ministry of Foreign Affairs before he became state secretary at the Ministry of Social Affairs in 1992. He was a party secretary for the Norwegian Labour Party from 1992 until 1996.
In 1996 he became Minister of Agriculture, remaining in that post for slightly less than a year. Andersen later became Minister of Trade and Industry on 29 September 2006, when Odd Eriksen resigned.