Lilja Sigurðardóttir (born 1972) is an Icelandic crime-writer and playwright. She has written six thrillers that mostly take place in Reykjavík.

Sigurðardóttir's latest novel Svik (No English title yet) will be published in Iceland by Forlagid Publishing in October 2018. Her novels have been published in Norwegian, Danish, Czech, Macedonian, Polish, French and English and film rights to the Reykjavík Noir Trilogy (Snare, Trap and Cage) have been sold to Palomar Pictures.