CIAA may refer to:

• Cayman Islands Athletic Association, the governing body for the sport of athletics in the Cayman Islands
• Central Intercollegiate Athletic Association, an NCAA Division II collegiate athletic conference
• Confederation of the Food and Drink Industries of the EU, a European trade organization
• Confederation of Indian Amateur Astronomer Association
• Conference on Implementation and Application of Automata, an international academic conference in computer science
• Cook Inlet Aquaculture Association, a non-profit organization promoting sustainable salmon fishing in Alaska
• Office of the Coordinator of Inter-American Affairs, the U.S. government office led by the Coordinator of Inter-American Affairs
• Comisión Investigadora de Accidentes de Aviación, Dominican Republic aviation accident investigation authority
• Commission for the Investigation of Abuse of Authority, an apex constitutional body for corruption control for the Government of Nepal