Nils Emaus Nilsen (24 May 1886 - 4 April 1976) was a Norwegian politician for the Labour Party.
He was born in Mosjøen.
He was elected to the Norwegian Parliament from the Market towns of Vest-Agder and Rogaland in 1950, but was not re-elected in 1954.
Nilsen held various positions in Haugesund city council in 1922 - 1931, 1937 - 1940 and 1945 - 1953, serving as mayor during the term 1945 - 1947.