| Acronym | Definition |
|---|
| DCIO➣Deputy Chief Information Officer (corporate title) |
| DCIO➣Defined Contribution Investment Only |
| DCIO➣Defense Criminal Investigative Organization (US DoD) |
| DCIO➣Division of Clearing and Intermediary Oversight (US CFTC) |
| DCIO➣Deputy Chief Inspecting Officer of railways; UK) |