| 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) |