Besor (, Nahal HaBesor) is a wadi in southern Israel. The stream begins at Mount Boker (near Sde Boker), and spills into the Mediterranean Sea near Al-Zahra in the Gaza Strip, where it is called Wadi Ghazzeh, also spelled Wadi Gaza. Further upstream it is marked as Wadi esh-Shallaleh on the 1878 Survey of Western Palestine map. There are several important archaeological sites located in this area.