| HTR | Hail The Rail 
| Others |
| HTR | Handicapping Technology and Research
| Others |
| HTR | Handwritten Text Recognition
| Others |
| HTR | Haplotype Trend Regression
| Others |
| HTR | Happy To Return
| Others |
| HTR | Hard Terrain Radial
| Others |
| HTR | Hard Tissue Replacement
| Others |
| HTR | Hard To Reach
| Others |
| HTR | Hard To Read
| Others |
| HTR | Hateruma, Japan
| Others |
| HTR | Heavy Tactical Rescue
| Others |
| HTR | Heavy Tactical Rifle
| Others |
| HTR | Helicopter Total Realism
| Others |
| HTR | Hellenic Technology of Robotics
| Others |
| HTR | Hemolytic Transfusion Reaction
| Others |
| HTR | High Tech Rochester
| Others |
| HTR | High Temperature Reactor
| Others |
| HTR | High Temperature Requirement
| Others |
| HTR | High Thermal Release
| Others |
| HTR | High Throughput Rheology
| Others |
| HTR | High Traffic Road
| Others |
| HTR | Hit The Road
| Others |
| HTR | Holiday Travel Resort
| Others |
| HTR | Holiday Trip Rentals
| Others |
| HTR | Home Theatre
| Others |
| HTR | Home Towne Realty
| Others |
| HTR | Honda Trading Romania
| Others |
| HTR | Honda Trouble Report
| Others |
| HTR | Hot Tin Roof
| Others |
| HTR | Housing Trade Relocation
| Others |
| HTR | Howard Tanner Redline
| Others |
| HTR | Human Telomerase RNA
| Others |
| HTR | Human Thomas Request
| Others |
| HTR | Human Tissue Repository
| Others |
| HTR | Hunt Tactical Range
| Others |
| HTR | Hunter and Trapper Registration
| Others |
| HTR | Hunting Tactical and Range
| Others |
| HTR | Hunting Tactical Range
| Others |
| HTR | Hydroxyl Terminated Polybutyiene
| Others |