OII may refer to:
Organisations edit
- OII, market exchange symbol for Oceaneering International
- Office of Innovation and Improvement, an office of the United States Department of Education
- Organisation Intersex International, a global advocacy and support group for people with intersex traits
- Oxford Internet Institute, a multi-disciplinary department, part of the University of Oxford, England
See also edit
- Organisation Intersex International Australia
- OII Europe
- Oii-Chinese, the Chinese language affiliate of Organisation Intersex International
This disambiguation page lists articles associated with the title OII.
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