The preferred choice when understanding tailoring trust legal expertise reliability dedication matters
Legal Expertise
Need help resolving disputes, executing transactions, or managing complex projects? We support your business across all areas of commercial law.
Our people
At Thommessen, you will find some of Norway’s leading lawyers. Find the right advisor for your project at our offices in Oslo, Bergen, Stavanger and London.
How we work
We are strategic advisors who understand your challenges and opportunities – and are genuinely committed to helping you achieve your goals in the best possible way. Learn more about how we work.
Expertise
- Administrative Sanctions and Criminal Liability
- Asset Management
- Banking and Financing
- Compliance
- Construction
- Consumer Markets
- Crisis Management
- Data Protection and Cyber Security
- Debt Capital Markets
- Defence and Security
- Dispute Resolution
- Employment
- Equity Capital Markets
- EU/EEA and Competition Law
- Finance regulation
- FinTech
- Fishery and Aquaculture
- Games, Arts, Music, Entertainment and Sports
- Insolvency and Restructuring
- Insurance
- Intellectual Property and Marketing Law
- Life Sciences and Health Tech
- M&A and Corporate Law
- Maritime and Offshore Emergency Response
- Oil and Gas
- Oil service
- Private Equity
- PropTech
- Public procurement
- Real estate
- Renewable Energy and Infrastructure
- Sanctions and Export Control
- Shipping and Offshore
- Sustainability and climate risk
- Tax and Duties
- Tech M&A
- Technology and digitalisation
- The Norwegian Security Act
- Venture Capital and Growth Equity
Gain insight into sustainability rules and initiatives
As the focus on sustainable development intensifies, sustainability regulation is accelerating. At Thommessen, our Sustainability Database supports you in navigating the complex web of regulatory changes and industry-led initiatives.
News
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Thommessen ranked as Norway's best law firm in the Prospera Survey -
Latest developments in the US regarding Global minimum tax ("GloBE")/Pillar II -
Thommessen awarded "Norwegian Law Firm of the Year 2025" by Chambers and Partners -
Thommessen Sustainability Update | Q2 2025 -
News and insights within litigation and arbitration: Highlights from Q1, 2025 -
Developing a modern legal framework for mineral extraction in Norway -
U.S. Reciprocal Tariffs – What it means for Norwegian Manufacturers and Exporters -
Latest Developments from the US Regarding Globe/Pillar II -
Approaching 31 March deadline for emission data reporting under EU MRV and EU ETS -
Thommessen is top ranked in 17 categories in The Legal 500
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We invest in our people
Read moreAwards and rankings
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2024 Prospera
Best Legal Competence
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2025 Kapital's Lawyer Survey
Most points overall
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2025 Chambers Europe Awards
Norwegian Law Firm of the Year