Thomas G. Naalsund provides advise and dispute resolution services, including litigation and negotiations, to Norwegian and foreign clients, particularly within the energy sector oil and gas). His experience extends to both contractual and regulatory issues.

Mr. Naalsund also has particular experience within public procurement, state aid and competition law, as well as insurance/pension related issues.

Mr. Naalsund is admitted to the Supreme Court and litigates regularly before Norwegian courts and arbitration panels. He also has experience from international arbitration and the EFTA Court as well as the European Court of Human Rights.

Mr. Naalsund is ranked as one of Norways' most prominent lawyers on dispute resolution, competition law and public procurement by Chambers and Partners and Legal 500. He is ranked as one of Norway’s leading lawyers on procurement law in the Norwegian Financial Daily’s annual lawyers' survey.

Thomas Naalsund is well regarded for his expertise in state aid and public procurement. Sources note that "he can see the whole picture and very quickly identify the key points and difficult areas that we need to focus on." Clients describe him as “a very good strategist when building a case for court,” adding that “his client service is excellent.”

Chambers Europe, 2018


  • Litigation for the Norwegian Government represented by the Ministry of Petroleum and Energy regarding the validity of amendments made to the Gassled tariff regulations. The court rejected the claims against the Norwegian Government, both for annulment of the amendments and for damages.
  • Litigation for oil companies in several international arbitration cases (ICC) regarding price adjustments in long-term gas sale agreements.
  • Substantial review, on behalf of Gassco, of the stipulation of new tariffs in Gassled

Professional Experience

  • Partner, Wiersholm, 2016
  • Partner, Kluge Advokatfirma, 2010
  • Lawyer, the Office of the Attorney General (Civil Affairs), 2000


  • Admitted to the Supreme Court, 2008
  • LLM (Master of Laws), London School of Economics, 2004
  • Cand. Jur., University of Oslo, 2000