Sigtuna Municipality (Sigtuna kommun) is a municipality in Stockholm County in east central Sweden. Its seat is located in the town of Märsta.
The municipality is a part of Metropolitan Stockholm.
The municipality consists of a lot of former local government units and was formed in 1971. It got its name from the small, but very old, City of Sigtuna, but the seat was placed in the much larger modern town of Märsta.
The three towns of the municipality are Märsta (pop. 23,000), Sigtuna (pop. 8,000) and Rosersberg (pop. 1,400), of which Märsta is the municipal seat and Sigtuna with its old and important history is a popular tourist destination.
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