| Acronym | Definition |
|---|
| HOR | Horizon/Horizontal |
| HOR | Horror (movies genre) |
| HOR | House of Representatives |
| HOR | Head of Region (various organizations) |
| HOR | Higher-Order Representation (consciousness theory) |
| HOR | Home Of Record |
| HOR | Halls of Reflection (World of Warcraft dungeon) |
| HOR | Higher Order Rewriting |
| HOR | Hydrogen Oxidation Reaction (chemistry) |
| HOR | Horta, Azores, Portugal (airport code) |
| HOR | Hell on Rails (RC aircraft) |
| HOR | House of Rahl (Terry Goodkind's Sword of Truth series) |
| HOR | Homie Onda Regular (musical group) |
| HOR | Hand-Over Request |
| HOR | Humber Oil Refinery (NE Lincolnshire, UK) |