Firse Sten (also known as Fisse Sten) is a rigorously geometric passage grave (Swedish: Ganggrift) located in the south of Falköping in the province of Västergötland, Sweden, which was excavated in 2008. It was constructed between 3500 and 2800 BCE as a megalithic structure of the Funnelbeaker culture. The passage grave is a type of construction from the late Neolithic period, comprising a chamber and a structurally separated, lateral passage. This form is primarily found in Denmark, Germany, and Scandinavia, with occasional occurrences in France and the Netherlands.