The County of Loon (Dutch: Graafschap Loon [ˈɣraːfsxɑp ˈloːn], French: Comté de Looz) was a county in the Holy Roman Empire, which corresponded approximately with the modern Belgian province of Limburg. It was named after the original seat of its count, Loon, which is today called Borgloon. During the middle ages the counts moved their court to a more central position in Kuringen, which today forms part of Hasselt, capital of the province.
From its beginnings, Loon was associated with the nearby Prince-bishop of Liège, and by 1190 the count had come under the bishop's overlordship. In the fourteenth century the male line ended for a second time, at which point the prince-bishops themselves took over the county directly. Loon approximately represented the Dutch-speaking (archaic French: thiois) part of the princedom. All of the Dutch-speaking towns in the Prince-Bishopric, with the status of being so-called "Good Cities" (French: bonnes villes), were in Loon, and are in Belgian Limburg today. These were Beringen, Bilzen, Borgloon, Bree, Hamont, Hasselt, Herk-de-Stad, Maaseik, Peer and Stokkem.