HDD

HDD may refer to:
 * H. D. Deve Gowda, former Prime Minister of India
 * Hard disk drive
 * Hand Drawn Dracula, a record label
 * Head-down display
 * Heating degree day
 * High definition display
 * Honorary Doctor of Divinity
 * Horizontal Directional Drilling
 * Hyderabad Airport (Sindh) (IATA:HDD), in Pakistan
 * /dev/hdd; see Device file § naming conventions
 * Hard Drive Divinity, the transformed state of CPUs in Hyperdimension Neptunia
 * Handan East railway station, China Railway pinyin code HDD