Ellefsen

Ellefsen is a surname. Notable people with the surname include:


 * Gunnar Ellefsen (1930–1997), Norwegian politician for the Labour Party
 * Håvard Ellefsen (born 1975), Norwegian electronic musician best known as Mortiis
 * Harald Ellefsen (born 1950), Norwegian politician for the Conservative Party
 * Henrik Ellefsen (born 1971), Norwegian businessman
 * Pauli Ellefsen (1936–2012), Faroese politician and member of the Union Party