CIAR may refer to:
- The Canadian Institute for Advanced Research, a virtual institute dedicated to collaborative advanced research and scholarship of relevance to the Canadian and global community.
- The Cornell International Affairs Review, a biannual peer-review student-run organization operating out of Cornell University, Ithaca, New York.
- The Center for Indoor Air Research, a non-profit organization established by the tobacco industry in 1988
- Acronym for The Customer Is Always Right