Kjetil Trædal Thorsen (b. 1958) is an architect and Founding Partner of Snøhetta. Since co-founding Snøhetta in Oslo in 1989, he has been instrumental in defining Snøhetta’s philosophy and growth into a transdisciplinary and global architecture and design practice, as well as major projects such as the Bibliotheca Alexandrina in Alexandria, Egypt, the Norwegian National Opera and Ballet, Le Monde Group Headquarters in Paris, Europe's first underwater restaurant and the world's northernmost energy-positive building.

For his work, he has been awarded the European Union Prize for Contemporary Architecture – Mies van der Rohe Award, the Aga Khan Award for Architecture and the Global Award for Sustainable Architecture, amongst others.

Kjetil Trædal Thorsen is a frequent lecturer, and from 2004 to 2008, he was Professor of Architecture at the Institute of Experimental Architecture at the University of Innsbruck, Austria. In addition, he often acts as a jury member for international design and architecture competitions and awards, such as the Obel

Snøhetta is one of 12 offices in the Triennale guild, supporting Oslo Architecture Triennale