OIF may refer to:
- Ocean iron fertilization, the intentional introduction of iron to the upper ocean to stimulate a phytoplankton bloom
- Office for Intellectual Freedom, a department of the American Library Association
- Operation Iraqi Freedom, the United States' code-name for the Iraq War from 2003 to 2010
- Optical Internetworking Forum, a non-profit industry organization founded in 1998
- Organisation internationale de la Francophonie, an international organization representing Francophonic and Francophilic countries and regions
This disambiguation page lists articles associated with the title OIF.
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