Loisy may refer to:
Surname Alfred Loisy (1857-1940), French theologian
Places Loisy, Meurthe-et-Moselle, a commune in the French region of Lorraine Loisy, Saône-et-Loire, a commune in the French region of Bourgogne Loisy-en-Brie, a commune in the French region of Champagne-Ardenne Loisy-sur-Marne, a commune in the French region of Champagne-Ardenne Grivy-Loisy, a commune in the French region of Ardennes