WIA may mean:
- Wounded in action
- Windows Image Acquisition, an image scanner API
- Wireless Institute of Australia, The Wireless Institute of Australia, an amateur radio society
- Workforce Investment Act of 1998, a US Federal Law
- Wellington International Airport, New Zealand
- Wattay International Airport, Laos
- Worst imaginable accident, in Risk analysis.
- War in Afghanistan
- The name Wia is an alternant spelling of the Wea tribe's name.