| Acronym | Definition |
|---|
| IBO | International Baccalaureate Organization |
| IBO | Independent Business Owner |
| IBO | Iron-Blooded Orphans (anime series) |
| IBO | International Bowhunting Organization (Vermilion, OH) |
| IBO | International Biology Olympiad |
| IBO | International Business Opportunities |
| IBO | Independent Budget Office (New York City) |
| IBO | International Business Office (various locations) |
| IBO | Initiatief Buitenschoolse Opvang (Dutch: Extracurricular Care Initiative) |
| IBO | International Boxing Organization (Coral Gables, FL) |
| IBO | International Broadcasting Operations |
| IBO | Interdepartementale Beleidsonderzoek (Dutch) |
| IBO | Input Back-Off (satellite communications) |
| IBO | Interconnect Business Optimization (software) |
| IBO | Irc.bungie.org (website) |
| IBO | International Broadcasting Organization |
| IBO | Investors Buy-Out |
| IBO | Image Based Object |
| IBO | Intelligence Brought Online Corporation |
| IBO | Information Based Organization |
| IBO | Instructor Boom Operator (USAF) |
| IBO | Infrastructure Business Operations |
| IBO | Internet Backbone Operations |
| IBO | Integrated Beverage Operation |