Olen is a municipality in the Belgian province of Antwerp, in the Flanders region of Belgium. It comprises three towns arranged along a south–north axis.
South of the E313 motorway and the Albert Canal lies Olen proper, also known as Olen-Centrum. Between the Albert Canal and Olen-station is the town of Boekel, also called Onze-Lieve-Vrouw-Olen (parish) or Achter-Olen (Behind-Olen). North of the railroad is the town of St.-Jozef-Olen (parish), also called Olen-Fabriek.
The municipality's layout is defined by these two major transport corridors, the Albert Canal and the E313 motorway to the south and the railway to the north, which separate its three constituent towns.