Vallentuna Municipality (Vallentuna kommun) is a municipality in Stockholm County in east central Sweden. Its seat is located in the town of Vallentuna.

The current municipality was established as a result of the municipal reform of 1971. Its coat of arms depicts an eagle, a broad axe and two stars.

The geography is still dominated by nature and agriculture and some lakes and streams, besides the urban areas. Many houses are one family houses.

Vallentuna has been expanding in recent years, and is one of the municipalities of the county that grows fastest every year, with more than 2% yearly, and has now doubled since 1971. Many people settle in Vallentuna because it is close to nature, and yet allows them to commute to their work places, both in Stockholm (to where the commuter gets you in 30 minutes) and elsewhere. In total, about 9,000 people commute from Vallentuna to other municipalities, while about 2,000 people commute into Vallentuna.

The municipality is served by the Stockholm public transport system through SL. There are nine stops on the narrow gauge Roslagsbanan suburban railway as well as a bus network.

All over the central part of Vallentuna you can find schools of different sorts, there is a cultureschool (Kulturskolan) that specialises in teaching music but also drama, musical and dance. Vallentunas "Högstadie skolor" (aimed for kids ages 12–16) are Hjälmstaskolan, Vittra Vallentuna, Hammarbackskolan, Bällstabergsskolan and Vallentuna Friskola. There also is a Secondary School ("gymnasieskola"), Vallentuna Gymnasium.

Vallentuna has two sports facilities; Vallentuna IP and Össeby IP. Vallentuna IP is a modern sports facility with track & field, soccer fields, ice hockey rinks, tennis courts and trail runs. Össeby IP has a track & field track, soccer field, trail runs, inside tennis courts, and an inside sports gym.^[8]