Sipoo (, ) is a municipality in Uusimaa, Finland. Sipoo had over 19,000 residents in the end of 2014. Neighbouring municipalities are Helsinki, Vantaa, Kerava, Tuusula, Järvenpää, Porvoo, Pornainen and Mäntsälä. The area of Sipoo is . The tax level of Sipoo is 18.75%. The leader of the municipality is Mikael Grannas.