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