An ultrasmall radiofrequency identification (RFID) tag antenna is proposed for metallic applications. The antenna consists of a loop structure on FR4 substrate with a chip on the side. The overall dimensions of the tag are 10 × 10 × 2.07 mm (0.03λ × 0.03λ × 0.006λ). Studies demonstrate that the proposed antenna is a good candidate for RFID tags to be mounted on metallic surfaces. Experimental results demonstrate that the tag is able to achieve a read distance of 20 cm with an equivalent isotropic radiated power of 1.64 W when attached to a metallic object. The proposed antenna is proved to be competitive against state of the art.