Grafschaft Hoya is a Samtgemeinde ("collective municipality") in the district of Nienburg, in Lower Saxony, Germany.
Its seat is in the town Hoya.
Its name refers to the medieval County of Hoya.
On 1 January 2011, it merged with the former Samtgemeinde Eystrup.
The Samtgemeinde Grafschaft Hoya consists of the following municipalities: This Nienburg district location article is a stub.