| Acronym | Definition |
|---|
| OIO➣Opera in the Ozarks (Eureka Springs, AR) |
| OIO➣Oracle Inter Office |
| OIO➣Offensive Information Operations (US DoD) |
| OIO➣Overseas Investment Office (New Zealand) |
| OIO➣Onderzoeker in Opleiding |
| OIO➣Offentlig Information Online (Danish: Public Information Online; Denmark) |
| OIO➣Open Infrastructure for Outcomes (medical software) |
| OIO➣Open Infrastructure Offering |
| OIO➣Office of the Investment Ombudsman (Korea) |
| OIO➣Office of Independent Oversight (US Department of Education) |
| OIO➣Operational Integration Office |