Kornwerderzand (West Frisian: Koarnwertersân) is a village on the Afsluitdijk, a major dam in the Netherlands that links Friesland with North Holland.

Kornwerderzand is located approximately 4 kilometers from the coast of Friesland, on a former artificial island which was created during the construction of the dam.

The Afsluitdijk provides a road link between the provinces of Friesland and North Holland.

During the German invasion of the Netherlands in World War II, the Kornwerderzand position was defended by Dutch troops.

The German troops, initially lacking support by heavy artillery, were unable to take the position.