Diessen is a village in the Dutch province of North Brabant. It is located in the municipality of Hilvarenbeek.
Diessen was a separate municipality until 1997, when it was merged with Hilvarenbeek.
Diessen is hypothesized to be the birthplace Deusone of the Gallic Emperor Postumus.
Coordinates: 51°28′N 5°11′E / 51.467°N 5.183°E / 51.467; 5.183