Graafstroom (Dutch pronunciation: [ɣraːfˈstroːm] ) is a former municipality in the western Netherlands, in the province of South Holland, and the region of Alblasserwaard. The former municipality had a population of 9,697 in 2004, and covered an area of 69.32 km2 (26.76 sq mi) of which 2.21 km2 (0.85 sq mi) was water. Since 2013 Graafstroom has been a part of the new municipality of Molenwaard (which ceased to exist in 2019).
The former municipality of Graafstroom consisted of the following population centres: Bleskensgraaf en Hofwegen, Brandwijk, Goudriaan, Molenaarsgraaf, Ottoland, Oud-Alblas, and Wijngaarden.