Oisy may refer to:
Places Billy-sur-Oisy, a commune in the Nièvre department in central France Oisy, Aisne, a commune in the Aisne department in Picardy in northern France Oisy, Nièvre, a commune in the Nièvre department in central France Oisy, Nord, a commune in the Nord department in northern France Oisy-le-Verger, a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France
See also Hugh I of Oisy (died circa 1111), the castellan of the town of Cambrai and a famous rebel against the authority of the bishops of the city