Nørholm, also called Nørholmen, is a manor house and agricultural property (1,850 decare) in Grimstad, in Aust-Agder county, Norway. The estate is most associated with its ownership by Nobel Prize winning author Knut Hamsun. 
The property was bought by Knut Hamsun in 1918, and has since been owned by members of the Hamsun family.  The financial award associated with the Nobel Prize made it possible for Knut Hamsun to expand the property significantly, and to live a life as farmer, much like the protagonist of his novel Growth of the Soil which had earned him the Nobel Prize in Literature. The current main building is from 1830, but was expanded by Hamsun in a neoclassical style. He also built several roads on the property.
Nørholm conservation was established in 1989 through the will of Ellinor (1915-1987) the daughter of Knut Hamsun and Marie Hamsun. Nørholm Foundation (Stiftelsen Nørholm) was created in 1995 by Victoria Hamsun, daughter of Knut's and Marie's youngest son, Arild Hamsun (1914-1988). The property is managed by Victoria Hamsun in cooperation with the Nørholm Foundation.
- O. Rygh: Norske Gaardnavne
- Nørholm før 1918 (Stiftelsen Nørholm)
- Om Ellinor Hamsuns Legat til Nørholms bevaring og Stiftelsen Nørholm (Stiftelsen Nørholm)
- Bratberg, Terje. "Nørholm". Store norske leksikon. Retrieved 29 June 2010.