Holbæk Municipality (1970-2006)
|Headquarters of the administration||Holbæk|
|Municipality since 2007||Holbæk Municipality|
The holbæk municipality was until December 2006 a Danish municipality in the former West Zealand in the northwest of the main Danish island of Zealand . Since January 2007 it has been part of the new Holbæk municipality together with the former municipalities of Jernløse , Svinninge , Tornved and Tølløse .