A method of providing a mask includes providing a first mask layer facing a second mask layer, in the second mask layer, providing a first opening which corresponds to a deposition opening of the mask, providing an auxiliary layer which faces the first mask layer with the second mask layer therebetween and covers the first opening, in the auxiliary layer, providing a second opening which corresponds to the first opening and exposes the first mask layer to outside the auxiliary layer, in the first mask layer, providing a third opening which corresponds to the first opening and the second opening by using the auxiliary layer as a mask and providing the auxiliary layer separated from the first mask layer and the second mask layer to provide the deposition mask having the first mask layer having the third opening and the second mask layer having the first opening.