HBO (disambiguation)
- Ancient Hebrew language (disambiguation)
- HBO
- HBO (Canadian TV channel)
- HBO Asia
- HBO Brasil
- HBO Europe
- HBO Go
- HBO Latin America Group
- HBO Max
- HBO Netherlands
- HBO Now
- HBOS
- Halo.Bungie.Org
- Hartung–Boothroyd Observatory
- Hoger beroepsonderwijs
- Hollywood Bowl Orchestra
- Home Box Office, Inc.
- Hyperbaric oxygen
- McKesson Corporation
- Metaboric acid
- Oxoborane