HWI

HWI may refer to:


 * Hauptman-Woodward Medical Research Institute, in Buffalo, New York, United States
 * Healthware International, an Italian advertising company
 * High water interval, or lunitidal interval, of tides
 * Horwich Parkway railway station, England
 * Humanity World International
 * Wismar, Germany, vehicle registration code
 * Hardware Wholesalers, Inc., now Do It Best, an American hardware retailer