Advokatfirmaet Thommessen AS (previously Thommessen Krefting Greve Lund) is a Norwegian law firm founded in 1856. It is the largest law firm in Norway and also considered one of Norway's leading corporate law firms. Thommessen has offices in Oslo

Oslo

Oslo is a municipality, as well as the capital and most populous city in Norway. As a municipality , it was established on 1 January 1838. Founded around 1048 by King Harald III of Norway, the city was largely destroyed by fire in 1624. The city was moved under the reign of Denmark–Norway's King...

, 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 , ....

 and London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

and employs approximately 170 lawyers. It is a full service law firm providing advice mainly to large Norwegian and international corporations. Thommessen is the largest Norwegian law firm within M&A in the Nordic region.

Thommessen has earned many awards and top-rankings. Who's Who Legal named Thommessen "Norway's Law Firm of the Year 2009". The firm is also ranked in the top tier category in the surveys of Legal 500 and Chambers and Partners.

Thommessen is the Norwegian member of Lex Mundi, a leading world-wide network of independent, distinguished law firms.