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: Bücken Eystrup Gandesbergen Hämelhausen Hassel Hilgermissen Hoya Hoyerhagen Schweringen Warpe Samtgemeinden in Lower Saxony