| Arne Thomassen | |
| Birth Date: | 13 February 1959 |
| Birth Place: | Lillesand |
| Nationality: | Norway |
| Notable Works: | Plumber |
| County mayor of Agder | |
| Party: | Conservative Party |
Arne Thomassen (born 13 February 1959) is a Norwegian politician for the Conservative Party.
He served as a deputy representative to the Parliament of Norway from Aust-Agder during the terms 2009 - 2013, 2013 - 2017 and 2017 - 2021.
He has been an elected member of Aust-Agder county council, mayor of Lillesand and leader of Aust-Agder Conservative Party.
In 2019, he was elected county mayor for Agder - the first after Aust-Agder and Vest-Agder were merged into one county and in 2023, he was re-elected as county mayor