The Dolmen de Saint-Martin-du-Larzac is a megalithic tomb located in the commune of Saint-Martin-du-Larzac in southern France. It was built during the Neolithic period, around 4000 BCE, and consists of several large standing stones supporting a large flat stone that forms the roof of the chamber. The dolmen is believed to have been used for burial rituals and is one of several megalithic sites in the area.