The Trou du Diable (translated in English as Devil's Hole) is a cave situated in St-Casimir municipality, in the province of Quebec, Canada.
The Trou du Diable is crossed by a stream (Nameless) whose last 900 meters are underground. The stream is a tributary of the Rivière Ste-Anne, few kilometers upstream of St-Casimir. The cave is the second longest in Quebec.
The Trou du Diable highest point is 6.8 metres above the bottom of the cave, at some places visitors have to crawl to move forward.