CSIA may refer to:
Airports edit
- Chhatrapati Shivaji International Airport, Mumbai, India
- Chengdu Shuangliu International Airport, Chengdu, Sichuan, China
Schools edit
- Camborne Science and International Academy, Cornwall, England
- Cheongshim International Academy, Gyeonggi Province, South Korea
- Columbus Spanish Immersion Academy, Ohio, U.S.