QCA

QCA may refer to:

• Qualifications and Curriculum Authority, formerly an executive non-departmental public body (NDPB) of the Department for Education in the United Kingdom
• 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
• Quantitative Coronary Angiography, a technique for measuring vessel diameters during angiography procedures.
• Quantum cellular automata, any one of several models of quantum computation
• Queensland College of Art, a specialist arts and design college located in South Bank, Brisbane, and Southport, Gold Coast Australia
• Queensland Cricket Association
• Quezon City Academy, a Secondary school in Quezon City, Philippines
• Quoted Companies Alliance, a not-for profit organisation representing small businesses
• Quad Cities Area, is a geographic region of the Mid-Mississippi Valley of the United States that includes several communities in the states of Iowa and Illinois.

and also :

• Mecca, Saudi Arabia's airport IATA code
• Qt Cryptographic Architecture, an opensource cross-platform crypto API based on Qt