| Acronym | Definition |
|---|
| WI | Within |
| WI | Wisconsin (US postal abbreviation) |
| WI | Wireless |
| WI | Web Intelligence |
| WI | Writing Intensive |
| WI | Women's Institute |
| WI | Web Interface (computer science) |
| WI | Western Sahara |
| WI | Work Items |
| WI | What If? |
| WI | West Indies |
| WI | Wrought Iron |
| WI | Weld(ing) Inspector |
| WI | Wirtschaftsinformatik (German) |
| WI | Working Interest |
| WI | Whitehead Institute (Massachusetts Institute of Technology; Cambridge, MA) |
| WI | Wallops Island (Virginia) |
| WI | Waste Incineration (EU) |
| WI | Wageningen International |
| WI | Women's Initiative (American University) |
| WI | When Issued (stocks) |
| WI | When Issued |
| WI | Woodwork Institute (formerly Woodwork Institute of California) |
| WI | Water Injection (oil industry) |
| WI | Water Intrusion |
| WI | Weight Indicator (various companies) |
| WI | Winrock International |
| WI | Wipro Infotech |
| WI | Weapons Inspector |
| WI | Wine Institute |
| WI | Work Instruction |
| WI | Water Index |
| WI | Williams International |
| WI | Write Image |
| WI | Weyl Invariance (physics) |
| WI | Waterloo Industries |
| WI | Work Input (simple machines) |
| WI | Warm Ischemia |
| WI | Weekly Indemnity (refers to short term disability insurance) |
| WI | Waveform Interpolation |
| WI | Workforce Informer (various organizations) |
| WI | Weak Infeed |
| WI | Wing Intelligence |
| WI | Wave Injector |
| WI | Warsaw Initiative |
| WI | Weapon Initiator |
| WI | Whurl Interactive (software) |
| WI | Women's Reserve Intelligence Duties (US Navy) |
| WI | Warfighter's Internet |