Mathias Augestad Ambjør is an actor working between Oslo and London. He trained at the Royal Academy of Dramatic Art (RADA), gaining a Master's degree in 2022. He started his formal actor training at Nord University in Norway in 2014 in the Lecoq tradition, graduating in 2017.
Mathias Augestad Ambjør is a theatre maker, and co-runs a theatre company called Feil Teater, founded in 2015. He has worked as an actor, director, dramatist, composer and producer for the company. In 2023 the company received a Hedda Award for Best Production for Children. They were nominated again in 2025 for Flukten fra Botsen, a show Mathias both co-directed and starred in.
Mathias started his professional career in film and television when he was 14 years old, in TV shows and film productions like Maskeblomstfamilien, Hotel Cæsar and The Light That I Feel. After graduating from RADA, he toured Europe with an adaptation of Animal Farm by George Orwell.
He then worked in the UK, before relocating to Oslo in 2023 to play Olaf in Frozen the Musical at Det Norske Teatret. In 2024 he was cast in Sportskoret, Spynorsk the Musical and the leading role of Julian in Snøsøstera at the same theatre. In 2025 he played the leading role in a national tour of Hundrevis av barn i vill kamp with Riksteatret.
In 2026 he was part of the cast of the award winning show The Uncontainable Nausea of Alec Baldwin by TG Works at New Diorama Theatre in London. In the autumn, he was assistant director to a new staging of Les Misérables at Folketeatret in Oslo.
In the 2026-2027 theatre season, Feil Teater will be curating and making new work at Scene 3 at Det Norske Teatret in Oslo. Mathias will first star in Den perfekte premieren, which opens November 19th 2026.