Sigtuna is a locality situated in Sigtuna Municipality, Stockholm County, Sweden with 8,444 inhabitants in 2010. It is the namesake of the municipality even though the seat is in Märsta. Sigtuna is, despite its small population, for historical reasons often still referred to as a stad. Statistics Sweden, however, only counts localities with more than 10,000 inhabitants as stads.
Although less significant today, Sigtuna has an important place in Sweden's early history. It is the oldest town in Sweden, having been founded in 980. The history of Sigtuna before the 11th century, as described in the Norse sagas and other early medieval sources, can be found in the article Old Sigtuna.
Sigtuna has a picturesque medieval town centre with restaurants, cafes and small shops. The old church ruins, runic stones and Stora gatan, the old main street, are popular attractions for tourists especially in the summertime. The small streets with the low built wooden houses lead up to several handicrafts shops and the old tiny town hall, Sigtuna Rådhus. There are restaurants and a hotel in the town centre.