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:
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