Sigtuna is a locality located in Stockholm County, Sweden. It serves as the namesake for the Sigtuna Municipality, although the administrative seat of the municipality is situated in the nearby locality of Märsta. As of 2020, the population of Sigtuna was recorded at 9,689 inhabitants.
The area is historically significant and is still frequently referred to as a stad for historical reasons. It remains a notable geographical point within the region due to this enduring historical designation.