GAA

Gaa may refer to:
 * Gaa language, a language of Nigeria
 * gaa, the ISO 639 code for the Ga language of Ghana

GAA may stand for:

Compounds

 * Glacial (water-free), acetic acid
 * Acid alpha-glucosidase, also known as glucosidase, alpha; acid, an enzyme
 * a codon for glutamic acid

Government

 * GADA 601, Argentine Army unit Grupo de Artillería Antiaérea 601 (Anti-Aircraft Artillery Group 601)
 * General Allotment Act, US law passed in 1887 regarding Indian land
 * Group Areas Acts, South African apartheid laws
 * General Appropriation Act, the legislative act used in some countries for a national or state budget

Organisations

 * Gaelic Athletic Association, governing body of Gaelic games such as hurling and Gaelic football
 * Gay Activists Alliance, New York City gay rights organisation 1969–81
 * Gemmological Association of Australia, an educational organisation based in Sydney
 * Global Accounting Alliance, an accounting organisation
 * Global Aquaculture Alliance, an international non-profit trade association
 * Grenada Athletic Association, the governing body for the sport of athletics in Grenada
 * Guam Adventist Academy, a private school in Guam

Other uses

 * GAA, the ICAO airline code for Business Express Airlines
 * Gaelic football, an Irish team sport commonly known as GAA
 * Generic Authentication Architecture, a mobile phone specification
 * Goals against average, goalkeeping statistic used by several sports and many leagues
 * Ford GAA engine
 * Gate-all-around, a specific type of 3D transistors