H4, H04 or H-4 can refer to various objects, places or status: Objects: » * H4 lamp, a dual-filament headlight bulb for automobiles * H-4 MUPSOW, a precision-guided glide bomb manufactured by Pakistan » * GNR Class H4, a 1920 British 2-6-0 steam locomotive model * HMS H4, a 1915 British Royal Navy H class submarine » * HMS Tenedos (H04), a 1918 British Royal Navy Admiralty 'S' class destroyer * Hughes H-4 Hercules (Spruce Goose), an aircraft » * PRR H4, an American model * USS H-4 (SS-147), a… (More on H4)