Halloy may refer to:
- Jean Baptiste Julien d'Omalius d'Halloy (1783-1875), Belgian geologist
- Halloy, Oise, a French commune
- Halloy, Pas-de-Calais, a French commune
- Château de Halloy, a castle in Halloy, Belgium
- Halloy, Belgium, a village in Belgium
See also
edit- Halloy-lès-Pernois, Somme, a French commune
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