Wiltenburg is a historic municipality and former free manor (vrije heerlijkheid) in the Dutch province of South Holland, on the southeastern edge of the Reeuwijkse Plassen.
Until 1820 Wiltenburg was (provisionally) administered by Sluipwijk, after that the lord resident of the estate claimed his rights to a municipality.
For one year Wiltenburg was a separate municipality, however the original declaration of the establishment of the free manor went missing.
Being unable to produce the document, the lord resident was deprived of his municipal rights and in 1821 Wiltenburg became part of Sluipwijk again.
The coat of arms of the free manor can be seen on the front gate and shows a shield azure, charged with a fleur-de-lis or and held by two lions rampant guardant or.