GIA or Gia may refer to:
- Armed Islamic Group (GIA, from French Groupe Islamique Armé), a terrorist Islamist group in Algeria.
- Gaming Intelligence Agency, a now defunct videogame news source.
- Garuda Indonesia Airways, an Indonesian airline.
- Gemological Institute of America.
- Ghana International Airlines
- 1980s supermodel Gia Marie Carangi.
- Gia, a 1998 film about Carangi.
- Gia, a number one single on the Billboard Hot Dance Airplay chart from 2004, recorded by Greek/German singer Despina Vandi.
- Gia people, an Indigenous Australian people
- GIA Publications, Inc. (formerly the Gregorian Institute of America), a Roman Catholic music publisher.
- Glasgow International Airport, an airport in Scotland.
- Government Information Awareness, a website which collects information about government programs, plans and politicians from the general public and numerous online sources
- GIA - The artistic name for a Canadian art designer.
