WI

WI may refer to:

* Wisconsin (United States postal abbreviations)
* Women's Institutes, locally organised groups for British women
* An abbreviation for the West Indies cricket team used in cricket statistics.

Wi or Wii may refer to:
* Wi (mythology), a Lakota deity
* Wi (kana), an obsolete Japanese character
* Wii, Nintendo's fifth and current home video game console previously codenamed "Revolution"