CIW has multiple meanings:
- California Institution for Women, a state prison in the USA
- Canadian Index of Wellbeing, that measures the wellbeing of Canadians over time
- Carnegie Institution of Washington
- Chicago and Illinois Western Railroad
- Central Indiana and Western Railroad
- Certified Internet Web Professional
- Coalition of Immokalee Workers
- Computational Intensive Workload
- ISO 639 language designation for Southwestern dialect of the Anishinaabe language, often called the "Chippewa language."
disambiguation page lists articles associated with the title CIW.
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