WPI

WPI is the abbreviation of:


 * Short use of DWPI (Derwent World Patents Index)
 * Whey protein isolate, a dietary supplement created by filtering milk protein
 * Whittemore Peterson Institute, performs research into chronic fatigue syndrome
 * Wholesale price index, the price of a representative basket of wholesale goods
 * Worcester Polytechnic Institute, a private research university in Worcester, Massachusetts, US
 * Work Personality Index
 * Worker-Communist Party of Iran, a political party
 * Wraps per inch, a measure of thickness of yarn