A Ganerbenburg is a castle occupied and managed by several families or family lines at the same time. These families shared common areas of the castle including the courtyard, well, and chapel, whilst maintaining their own private living quarters. They occurred primarily in medieval Germany.

A Ganerbschaft, according to old German inheritance law, was a joint family estate, mainly land, over which the co-heirs (Ganerben) only had rights in common. In modern German legal parlance it corresponds to a "community of joint ownership".