Lars Torvald Christiansen (born November 21, 1933) is an American politician. A member of the Republican Party, he served in the New Hampshire House of Representatives from 1996 to 2016.
Christiansen was born in Saugus, Massachusetts, the son of Carl and Anna Christiansen. He attended and graduated from Fitchburg State College. After graduating, he served in the United States Army, which after his discharge, he served as a member of the Hudson school board in Hudson, New Hampshire.
Christiansen served in the New Hampshire House of Representatives from 1996 to 2016.