| Acronym | Definition |
|---|
| H2H➣Head to Head |
| H2H➣Happy to Help (also seen as HTH) |
| H2H➣Highway to Hell |
| H2H➣Heart to Heart |
| H2H➣Hard to Handle |
| H2H➣Hand to Hand (combat) |
| H2H➣Human to Human (transmission of disease) |
| H2H➣Human to Human (information technology, business process management) |
| H2H➣Hanoi to Ho Chi Minh City (Vietnam) |
| H2H➣Host to Host |
| H2H➣Head to Hollywood (brain tumor survivor organization) |
| H2H➣Here to help |
| H2H➣Halfway to Hazard (band) |
| H2H➣Heroes to Hired (military civilian job transition) |
| H2H➣Haney to Harrison (Vancouver, BC, Canada race) |
| H2H➣House 2 Home (various organizations) |
| H2H➣Helmet2Helmet (NFL forum) |
| H2H➣Hero to Hero (troop morale campaign) |
| H2H➣Him to Her |
| H2H➣Hummer 2 Hydrogen (GM experimental hydrogen fuel cell-powered SUV) |
| H2H➣Hazardous 2 Health (gaming) |