HTA
- Chita-Kadala International Airport
- HTML Application
- Hapoel Tel Aviv F.C.
- Hard Truck Apocalypse
- Harris Tweed Authority
- Hawaii Technology Academy
- Health Technology Assessment (journal)
- Health technology assessment
- Heavier than air
- Helitrans
- High Tech Academy
- Highway Traffic Act
- Hizb ut-Tahrir America
- Holy Trinity Academy (disambiguation)
- Home Team Academy
- Home Technology Association
- Home team advantage
- Horticultural Trades Association
- Hot Thespian Action
- Human Tissue Authority
- Humboldt Transit Authority