Destination Unknown is a novel by Agatha Christie. The book is about a young woman who is persuaded to go on a suicide mission to find a missing scientist. The woman, Hilary Craven, is a deserted wife and bereaved mother who is planning suicide in a Moroccan hotel. She is asked by British secret agent Jessop to undertake a dangerous mission as an alternative to taking an overdose of sleeping pills.

The book was originally published in 1955.