Halloy

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