Events

• Operation Iraqi Freedom - The initial portion of the Iraq War

Formats

• Object Interchange Format

Foundations

• For the Optimist International Foundation, see Optimist International.
• Osteogenesis Imperfecta Foundation

Offices

• For Office for Intellectual Freedom, see American Library Association.

Organizations and forums

• International Organization of the Francophonie (Organisation internationale de la francophonie)
• Optical Internetworking Forum - communications industry forum