Bernhard Berthelsen was a Norwegian politician for the Liberal Party.

Berthelsen was born in Sør-Audnedal

Sør-Audnedal

Sør-Audnedal is a former municipality in Vest-Agder county in Norway. It is located in the central part of the present-day municipality of Lindesnes.-Name:...

. He was elected to the Norwegian Parliament from the Market towns of Telemark and Aust-Agder counties

Market towns of Telemark and Aust-Agder counties

The Market towns of Telemark and Aust-Agder counties was an electoral district for parliamentary elections in Norway. It comprised the market towns of Brevik, Kragerø, Notodden, Porsgrunn and Skien in Telemark county and Arendal, Grimstad and Risør in Aust-Agder county.The district was...

 in 1945, and was re-elected on one occasion.

Berthelsen was a deputy member of the executive committee of Arendal

Arendal

is a town and municipality in the county of Aust-Agder, Norway. Arendal belongs to the traditional region of Sørlandet.The town of Arendal is the administrative center the municipality and also of Aust-Agder county...

 city council from 1934 to 1940. He then sat as a regular city council member in the periods 1940–1944 and 1945–1946. He was later a member of Bergen

Bergen

Bergen is the second largest city in Norway with a population of as of , . Bergen is the administrative centre of Hordaland county. Greater Bergen or Bergen Metropolitan Area as defined by Statistics Norway, has a population of as of , ....

city council during the term 1955–1959.