Frithjof Fearnley (December 16, 1896 – April 18, 1971) was a Norwegian actor.

He performed extensively in lighter repertoire, but he also played Aegeus in Medea, Mephistopheles in Faust, and Professor Higgins in Pygmalion.

He was also popular in comedy roles, such as Preben in På solsiden and the church servant Evensen in Den store barnedåpen.

As an actor, he was active until shortly before his death.

He was married to the actress Randi Brænne for a time.