QCA may refer to:
Computing
- Quantum cellular automata, any one of several models of quantum computation
- Quantum dot cellular automaton, a proposed improvement on conventional computer design
Education
- Queensland College of Art, former name of Queensland College of Art and Design, an art and design college in Brisbane and Southport, Queensland, Australia
- Quezon City Academy, a secondary school in Quezon City, Philippines
Organisations and government agencies
- Qualifications and Curriculum Authority, formerly an executive non-departmental public body (NDPB) of the Department for Education in the United Kingdom
- Queensland Cricket Association
- Quoted Companies Alliance, a not-for profit organisation representing small businesses
Other uses
- QCA, IATA code of Mecca, Saudi Arabia's airport
- Qualitative comparative analysis, a technique for solving the problems that are caused by making causal inferences on the basis of only a small number of cases
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