Karsten Ludvig Sølvberg (19 January 1905 – 1976[1]) was a Norwegian communist, trade unionist and agent during the Second World War.
Before the Second World War he was a trade unionist and member of the Communist Party.
[4] He was initially a member of the resistance movement, and was arrested in October 1942 by account of "illegal activity".
[2] He is best known for unveiling the Communist Party organizational centres in 1942, which had been established in secrecy in Vikersund and Hemsedal.
[7] He was however acquitted of treason by Oslo City Court in 1949, when tried as a part of legal purge in Norway after World War II.