Labyrinth is an archaeological mystery English-language novel written by Kate Mosse set both in the Middle Ages and present-day France. It was published in 2005.

It divides into two main storylines that follow two protagonists, Alaïs (from the year 1209) and Alice (in the year 2005). The two stories occur in a shared geography and intertwine. The novel relies heavily on historical events such as the massacre at Béziers and the Crusade against the Cathars in Occitania, now the South of France, from around 1200. The text itself features many Occitan and French quotes. Ultimately the story becomes a quest for the Holy Grail.