Heinrich von Hannover est né le 29 avril 1961 à Hanover, Basse-Saxe, Allemagne. Il est marié avec Thyra von Westernhagen depuis le 19 juin 1999. Lui et Thyra von Westernhagen ont trois enfants.
Children: Albert Thilo Ludwig Arndt (b. December 14th 1999 in Göttingen), Eugenia Friederike (b. July 19th 2001 in Göttingen) and Julius Eduard Emanuel (b. February 22sd 2006 in Göttingen), as well as Oscar Julius Heinrich Ferdinand Nick (b. September 29th 1996 in Berlin) by former girlfriend Désirée Nick.