Jevnaker is a municipality in Oppland county, Norway. The administrative centre of the municipality is the village of Jevnaker with a population of 4,302.The parish of Jævnaker was established as a municipality on 1 January 1838 (see formannskapsdistrikt). The area of Lunner was separated from the municipality of Jevnaker on 1 January 1898 to form a municipality of its own.
The municipality (originally the parish) is named after the old Jevnaker farm (Old Norse: Jafnakr), since the first church was built here. The first element is jafn which means "even" or "flat" and the last element is akr which means "field" or "acre". Prior to 1889, the name was written "Jævnaker".