Olaug Nilssen (born 28 December 1977) is a Norwegian novelist, playwright, children's writer, essayist and magazine editor.

[1] Among Nilssen's early novels are Innestengt i udyr from 1998 and Vi har så korte armar from 2002.

In 2004 she published the children’s book Ronnys rumpe, and in 2005 the essays collection Hybrideleg sjølvgransking.

[1] Her novel Få meg på, for faen from 2005 was adapted for theatre, and was also basis for the 2011 film Turn Me On, Dammit!, directed by Jannicke Systad Jacobsen and starring Helene Bergsholm.

[1] She received the Fritt Ord Award in 2021, shared with Bjørn Hatterud [no] and Jan Grue,[6] for their contributions to freedom of speech in Norway by drawing attention to the barriers faced by disabled persons.