| Acronym | Definition |
|---|
| IFOS➣International Festival of the Sea (UK) |
| IFOS➣International Fish Oil Standards (Ontario, Canada) |
| IFOS➣International Federation of Oto-Rhino-Laryngological Societies (est. 1965) |
| IFOS➣International Federation of Ophthalmological Societies (San Francisco, CA) |
| IFOS➣Innovative Fiber Optic Solutions (est. 2001; Middletown, OH) |
| IFOS➣It's Five O'Clock Somehwere |