Horne (also Horn, Hoorn or Hoorne) is a small historic county of the Holy Roman Empire in the present day Netherlands and Belgium.
After the execution in 1568 of Philip de Montmorency who died without male heirs, the Prince-Bishop of Liège, as suzerain of Horne, was declared the direct lord and new count.
Horne maintained its own laws and customs as well as its financial autonomy.
The county included the communes of Neer, Nunhem, Haelen, Buggenum, Roggel, Heythuysen, Horne, Beegden, Geystingen and Ophoven.
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