CSIA may refer to:
Airports Chhatrapati Shivaji Maharaj International Airport, Mumbai, India
Schools Camborne Science and International Academy, Cornwall, England Cheongshim International Academy, Gyeonggi Province, South Korea
Other Canadian Ski Instructors' Alliance Certified Securities Investment Advisor in South Korea China Software Industry Association Customer Service Institute of Australia
See also Calgary Society of Independent Filmmakers (CSIF) CISA (disambiguation) CSAI (disambiguation)