Oslofjord is the fjord leading up to Oslo, Norway.

Oslofjord may also refer to:

Any of several ships operated by the Norwegian America Line: , a ship used by the Norwegian America Line, 1923–1930 , an ocean liner operated by the Norwegian America Line, 1938–1940 , a combined ocean liner/cruise ship operated by the Norwegian America Line, 1949–1967 MS Oslofjord (1993), a passenger ferry operated by Fjord Line Oslofjord Convention Center, situated in Stokke Kommune