Lunner was established when it was separated from the municipality of Jevnaker on 1 January 1898.

The municipality (originally the parish) is named after the old Lunner farm (Old Norse: Lunnar), since the first church was built here.

(The farm and the church are located on a long hill which was probably compared to a log.

The arms show a Lily of the Valley, as a symbol for the forests in the area.

[5] Lunner is bordered to the north by the municipality of Gran, to the east by Nannestad, to the south by Nittedal and Oslo, and to the west by Jevnaker.