HLO
| Acronym | Definition |
|---|---|
| HLO | Hello |
| HLO | High Level Orchestrator |
| HLO | Helicopter Landing Officer (offshore oil and gas industry) |
| HLO | High Level Outcome (various organizations) |
| HLO | High Lunar Orbit |
| HLO | Helicobacter-Like Organism |
| HLO | Hot-line Operator |
| HLO | Hispanic Latino Outreach (Brady Center to Prevent Gun Violence; Los Angeles-based program) |