Klaus Hagerup (5 March 1946 – 20 December 2018) was a Norwegian author, translator, screenwriter, actor and director.

The youngest of two brothers, he debuted with the poem collection "Slik tenker jeg på dere" ("This is how I think about you") in 1969.

During 1968–69 he worked at the Bergen theatre Den Nationale Scene and later at Nationaltheatret and Hålogaland Teater as an actor, instructor, director and writer.

He has also acted in several movies, but is better known as a writer of plays for scene and radio theater.

In 1988, he wrote a biography "Alt er så nær meg" ("Everything is so close to me") about his famous mother, Inger Hagerup.