Ragnar Karl Viktor Christiansen (28 December 1922 in Drammen) was a Norwegian politician for the Labour Party.
He was elected to the Norwegian Parliament from Buskerud in 1958, and served five terms. He had previously served in the position of deputy representative during the terms 1950–1953 and 1954–1957. Christiansen held several ministerial portfolios through the years; he was appointed Minister of Finance in 1971–1972 during the first cabinet Bratteli and Minister of Transport and Communications in 1976–1978 during the cabinet Nordli. During the first period he was replaced in the Norwegian Parliament by Egil Solin Ranheim; during the second period he was replaced by Olaf Øen.
On the local level he was a member of Nedre Eiker municipality council from 1945 to 1959, serving as mayor during the term 1955–1957. From 1955 to 1957 he was also a member of Buskerud county council. He chaired the local party chapter for several periods, and the county chapter from 1955 to 1956.
Outside of politics, he spent his career in the Norwegian State Railways. He started as errand boy in 1940 and left in 1977 as a managing clerk. His career ended with the post of County Governor of Buskerud, which he held from 1979 to 1989.
| Preceded by Ole Myrvoll |
Norwegian Minister of Finance 1971–1972 |
Succeeded by Jon Ola Norbom |
| Preceded by Annemarie Lorentzen |
Norwegian Minister of Transport and Communications 1976–1978 |
Succeeded by Asbjørn Jordahl |
| Preceded by Gunnar Alf Larsen |
County Governor of Buskerud 1979–1989 |
Succeeded by Leif Haraldseth |
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