CIAA may refer to the:
- Central Intercollegiate Athletic Association, a U.S. athletic conference competing in NCAA Division II
- Confederation of the Food and Drink Industries of the EU, a European trade organization
- Confederation of Indian Amateur Astronomer Association, a conglomeration of amateur astronomers and amateur astronomy associations from India
- Conference on Implementation and Application of Automata, an international academic conference in computer science
- Cook Inlet Aquaculture Association a non-profit organization that works to promote sustainable salmon fishing in Alaska
- Coordinator of Inter-American Affairs, the head of the U.S. government's Office of Inter-American Affairs
- Cayman Islands Airports Authority, the operator of the three airports in that country
- Cayman Islands Athletic Association, the governing body for the sport of athletics in the Cayman Islands
- Comisión Investigadora de Accidentes de Aviación, the Dominican Republic aviation accident investigation authority