HVO
HVO is the abbreviation for:
- Hawaiian Volcano Observatory , a volcanic research institute in the United States
- Historical association for Upper Franconia
- Hrvatsko vijeće obrane (Croatian Defense Council), the Croatian army in Bosnia-Herzegovina during the Bosnian War
- Hydrogenated vegetable oil (hydrotreated vegetable oil), u. a. NeXBTL
HvO is the abbreviation for:
- On-site helpers , support for the ambulance service