Rolf Eilert Gerhardsen (3 February 1902 – 21 November 1971) was a Norwegian journalist and leader of the Oslo branch of the Norwegian Labour Party.
He was born in Kristiania as a son of Gerhard Olsen (1867–1949) and Emma Hansen (1872–1949).
He was a brother of Einar Gerhardsen, and through him an uncle of Rune Gerhardsen and granduncle of Mina Gerhardsen.
He was a subeditor of Østfold Arbeiderblad and Sarpsborg Arbeiderblad from 1928 to 1934 and Vestfold Arbeiderblad from 1934 to 1940, and editor-in-chief of Den 1ste Mai in 1940.
When the occupation of Norway by Nazi Germany started, Gerhardsen fled to Sweden where he edited the publication Norges-Nytt at the Norwegian legation in Stockholm.
After the Second World War he was a subeditor in Arbeiderbladet from 1945 to 1952 and news editor from 1952 to 1970.He also chaired the Oslo branch of the Norwegian Labour Party and was known as an anti-Communist.
In post-World War II Norway he built up a private intelligence service on behalf of the Labour Party, the so-called Alpha Network.
He was also chairman of the Norwegian News Agency.
He released three books, including 1967's Einar Gerhardsen som en bror ser ham about his brother.