Apparatus for applying labels onto hollow bodies, including a blow mold having a cavity for containing a hollow body, and a member movable toward and away from the mold cavity, the member having an end conforming to the curvature of the cavity and forming a section thereof for carrying a label to be applied to the hollow body during movement of the member toward the cavity. Ventilation openings are provided in the mold for venting any air which may be present between the hollow body and the label during application. Suction openings are provided in the member for securely maintaining the label in place on the member, and pressure openings are also provided in the central portion member to cause the label to bow outwardly, thereby presenting a convex surface to the hollow body.