| HTTC | Hach Technical Training Center 
| Others |
| HTTC | Hacker Trip To China
| Others |
| HTTC | Hampton Table Tennis Club
| Others |
| HTTC | Hard To The Core
| Others |
| HTTC | Harmonic Temporal Timbral Clustering
| Others |
| HTTC | Harmonic-Temporal-Timbral Clustering
| Others |
| HTTC | Harvard Table Tennis Club
| Others |
| HTTC | Health Technology Transfer Center
| Others |
| HTTC | Heavy Transport Training and Consultancy
| Others |
| HTTC | HEED Technical Training Center
| Others |
| HTTC | Helitours Technical Training Center
| Others |
| HTTC | Hellenic Technology Transfer Center
| Others |
| HTTC | High Temperature Tribology Conference
| Others |
| HTTC | Higher Teacher Training College
| Others |
| HTTC | Hillingdon Table Tennis Club
| Others |
| HTTC | Hinckley Town Tennis Club
| Others |
| HTTC | Holy Trinity Teachers College
| Others |
| HTTC | Holy Trinity Teachers' College
| Others |
| HTTC | Home Team Tactical Centre
| Others |
| HTTC | Home Town Technology Consultants
| Others |
| HTTC | Hospitality and Tourism Training Centre
| Others |
| HTTC | Hotel and Tourism Training Centre
| Others |
| HTTC | Hydrogen Technology Transfer Centre
| Others |