Haus Hemer, Manor house in Hemer, Germany.

Haus Hemer is a two-story rectangular manor house with a square corner tower capped by a Welsh hood. It was built as a water castle in the 17th century; the moats are now dry, and a bridge marks where they once were. The outbuildings date from the 18th century.

The original estate arose around 1072 as a supply property for Grafschaft Abbey. The current building was constructed mainly in the 17th century when the site was transformed into a fortified water castle.

The name Haus Hemer comes from the medieval Oberhof Hademare, recorded in 1072. Since 1957 the manor has belonged to the Catholic parish of St. Peter and Paul, which used it as a children's home until 1980. Today the parish runs a kindergarten here and rents the hall to outside groups for events.

Haus Hemer is owned by the Catholic parish of St. Peter and Paul, which uses it as a community centre and kindergarten; the hall can also be rented by third parties for events. The dry moat is crossed by a bridge, and the 18th-century outbuildings stand beside the main house.

The property preserves the layout and structures of a medieval water castle with its moats, even though the visible building dates from a later period. This layering of old defensive elements with later architecture makes the place a rare example of how defensive structures were transformed.