CSIA may refer to:
- Canadian Ski Instructors' Alliance
- Chhatrapati Shivaji International Airport, Mumbai, India
- Chengdu Shuangliu International Airport, Chengdu, Sichuan, China
- CheongShim International Academy, an international school in South Korea
- China Software Industry Association
- Control System Integrators Association
- Columbus Spanish Immersion Academy, a school in Ohio, U.S.
- Chimney Safety Institute of America
- Certified Securities Investment Advisor in South Korea
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