Mr. Magnús Haukur Magnússon graduated from The University of Iceland in June 1984 as a lawyer and has practised as a lawyer since 1985. He became a partner in a law firm in Iceland in 1991 and joined Sigurjónsson & Thor ehf. as a partner in 1997. Mr. Magnússon is a member of FICPI, the Icelandic Bar Association and became a Supreme Court Attorney in November 1996. He is an European Patent Attorney and a member of The Association of Icelandic Trademark and Patent Agents. Served on the board of The Association of Icelandic Trademark and Patent Agents since 2007.
Served on the Board of Appeal in Competition matters in 1999- 2000.

Magnús Haukur Magnússon was a guest speaker at INTA Roundtable discussion in Reykjavik, Iceland on the “IP Translator Case” (CJEU ruling C-307/10) and its effects on practice on both the PTO and local agents on March 12,2013.  His contribution is summarized here.

Chambers 2024

“The lawyers have broad experience in trade mark matters.”

“The practitioners are extremely smart, business-minded and highly knowledgeable.”

Magnús Haukur Magnússon is a highly experienced practitioner in the IP market, known for his work in trade mark prosecution and litigation. “Magnús is great to work with.”

Valborg Kjartansdóttir “Valborg is responsive and reliable.”

WTR 1000 – The World’s Leading Trademark professionals:


Gold – Firms
Established in 1950, “Sigurjónsson & Thor is a first-rate firm for any trademark matters that arise in Iceland. It is home to exceptionally knowledgeable lawyers who are passionate and who thoroughly outline to clientele what must be done to protect their rights.” With almost four decades under his belt, “Magnús Haukur Magnússon is a prominent figure for Icelandic trademark work, bringing a practical and business-minded approach to disputes”. He leads the department alongside Valborg Kjartansdóttir, “an incredibly intelligent practitioner with in-depth knowledge of both trademark and patent law”, and who excels when handling enforcement matters. Also on deck, Magnús Hrafn Magnússon brings his expertise to start-ups and internationals alike. “A highly energetic and passionate practitioner, Magnús effectively secures optimal protection for clients.”

Chambers 2022

“The lawyers have a wide knowledge of the legal systems, both locally and internationally. They are real experts. Their responsiveness is one of their top qualities.”

Notable practitioners
Valborg Kjartansdóttir is knowledgeable in trade mark registration and opposition mandates. “Valborg Kjartansdóttir has unbeatable knowledge in IP.”

Magnús Haukur Magnússon is a highly experienced practitioner in the IP market, assisting clients with trade mark prosecution and litigation. “He is very capable and has longstanding experience.” “Magnús Haukur Magnússon is totally reliable.”

Legal 500 2024

Sigurjónsson & Thor ehf. specialises in IP matters, and acts for a prestige client base of multinational corporates on both contentious and non-contentious mandates. The group is notably strong in IP disputes, with significant experience in litigation and arbitration proceedings at all levels. The highly experienced Magnús Haukur Magnússon co-leads the team alongside Supreme Court attorney Magnús Hrafn Magnússon and IP and patent specialist Valborg Kjartansdóttir.


‘Sigurjónsson’s practice is a professional yet personal practice.’

‘They make you feel like you are a special client and the vibe they give is really good.’

‘Magnús Hrafn Magnússon is straightforward and imaginative. Good lawyer.’


Legal 500  

Leading individual 2022 and Legal 500 HALL OF FAME


Managing Intellectual Property 2021 Chambers and Partners
Trade mark star 2022 Ranked Band 1 in Chambers Europe 2022
World Trademark Review
Recommended Individual 2023