Oscar Christian Gundersen (17 March 1908 – 21 February 1991) was a Norwegian politician for the Labour Party.

In 1958 he left that position to become Norwegian ambassador to the Soviet Union, a post he held until 1961.

Gundersen was now Minister of Justice and the Police again, a post he held until the fourth cabinet Gerhardsen fell in 1965.

The work led to a new §14 and an altered §62 in the Constitution of Norway, leading to State Secretaries being eligible for general election and establishing the role as political.

Propositions about granting access for State Secretaries to parliamentary debates without the ability to vote, to which Gundersen agreed, failed.