| Acronym | Definition |
|---|
| HBD | Happy Birthday |
| HBD | Homebrew Digest |
| HBD | Hamburg Blue Devils (Hamburg, Germany) |
| HBD | Hard Bit Decision |
| HBD | Hot Box Detector (railway engineering) |
| HBD | Hidden Button Down (shirt type) |
| HBD | Human Biodiversity |
| HBD | Hydrogen Bond Donor |
| HBD | Here Be Dragons |
| HBD | Heat Balance Diagram (thermal power) |
| HBD | Has Been Drinking (police communications) |
| HBD | Holden by Design (car enhancement company; Australia) |
| HBD | Hadron Blind Detector |
| HBD | Hypophosphatemic Bone Disease |
| HBD | Hemoglobin--Delta Locus |
| HBD | Heartbreaking Dawns (est. 2008; Rosendale, NY) |
| HBD | Hot Bearing Detector (trains) |
| HBD | Honored By Death (gaming clan) |
| HBD | Honored By Death (gaming clan, Battlefield 2) |
| HBD | Haters Better Duck (band) |
| HBD | Hybrid Booster Drive (Electric Vehicle Institute) |
| HBD | Hydraulic Bottom Detector |
| HBD | Half Board |
| HBD | Hierarchical Block Design |
| HBD | Highest Benefit Density |
| HBD | Handheld Business Device |
| HBD | Here by Demand (various organizations) |
| HBD | Hot Bus Driver |