WGA is an abbreviation for:
- Image resolution, actually WVGA
- Heat conditioning system, system for heat acclimatization by fire service personnel
- Wheat Germ agglutinin protein that binds specifically certain sugar molecules
- Williams Gateway Airport, Phoenix-Mesa Gateway Airport see
- Windows Genuine Advantage verification of the software license from Microsoft
- Writers Guild of America, common union of the authors in the film and television industry in the U.S.