| ATR | A Tape Reader 
| Others |
| ATR | Abe T Rosenthal
| Others |
| ATR | Ability to Repay
| Others |
| ATR | Above The Rest
| Others |
| ATR | Absent Teacher Reserve
| Others |
| ATR | Absolute Time Reference
| Others |
| ATR | Acceptance Test Report
| Others |
| ATR | Acceptance Test Review
| Others |
| ATR | Access To Recovery
| Others |
| ATR | Accommodated Test Request
| Others |
| ATR | Accord Type R
| Others |
| ATR | Accounting to Reporting
| Others |
| ATR | Accumulated Time Record
| Others |
| ATR | Accuracy Timeliness Responsiveness
| Others |
| ATR | Achilles Tendon Reflex
| Others |
| ATR | Acid Test Ratio
| Others |
| ATR | Action Taken Report
| Others |
| ATR | Action Tracking Register
| Others |
| ATR | Active Time Report
| Others |
| ATR | Adaptive Temporal Recursion
| Others |
| ATR | Adaptive Transformation
| Others |
| ATR | Additional Testing Required
| Others |
| ATR | Advanced Tactical Radar
| Others |
| ATR | Advanced Technologies and Research
| Others |
| ATR | Advanced Technology And Research
| Others |
| ATR | Advanced Technology Recycling
| Others |
| ATR | Advanced Telecommunications Research
| Others |
| ATR | Advanced Term Registration
| Others |
| ATR | Advanced Thermo Resin
| Others |
| ATR | Advanced Tongue Root
| Others |
| ATR | Adventure Tour Race
| Others |
| ATR | Aeronautical Test Range
| Military, Air Force, Satellite Technology |
| ATR | African Traditional Religion
| Others |
| ATR | After The Revolution
| Others |
| ATR | AGS to RHIC
| Others |
| ATR | Air Transport Rack
| Others |
| ATR | Air Transport Rated
| Others |
| ATR | Alaska Trauma Registry
| Others |
| ATR | Albemarles Technology Resource
| Others |
| ATR | Alexa Traffic Rank
| Others |
| ATR | All Terrain Radial tire
| Others |
| ATR | All Terrain Rifle
| Others |
| ATR | All Terrain Rig
| Others |
| ATR | All Terrain Road
| Others |
| ATR | All That Remains
| Others |
| ATR | All Things Rock
| Others |
| ATR | Alliance Terminal Railroad
| Others |
| ATR | Almost Totally Real
| Others |
| ATR | Alpha Test Realm
| Others |
| ATR | Alternate Trunk Routing
| Others |
| ATR | American Technical Resources
| Others |
| ATR | Americans for Tax Reform
| Others |
| ATR | Amicale du Tracteur Renault
| Others |
| ATR | and the Role
| Others |
| ATR | Andy's Techno Rules
| Others |
| ATR | Annual Temperature Range
| Others |
| ATR | Annual Training Requirement
| Others |
| ATR | Answer To Reset
| Others |
| ATR | Antenna Test Range
| Others |
| ATR | Anti Tank Rifle
| Others |
| ATR | Apollo Token Ring
| Others |
| ATR | Appropriate Technical Resources
| Others |
| ATR | Arena Technical Resources
| Others |
| ATR | Arithmetical Transfinite Recursion
| Others |
| ATR | Arkansas Trucking Report
| Others |
| ATR | Army Training Regiment
| Others |
| ATR | Art Therapist Registered
| Others |
| ATR | Articulated Tail Rotor
| Others |
| ATR | Assess Transform Reach
| Others |
| ATR | Atar, Mauritania
| Others |
| ATR | Atari Teenage Riot
| Others |
| ATR | Ataxia Telangiectasia and Rad3
| Others |
| ATR | Atrophy
| Others |
| ATR | Attack The Radical
| Others |
| ATR | Attack The Rim
| Others |
| ATR | Attenuated Total Reflectance
| Others |
| ATR | Attenuated Total Reflection
| Others |
| ATR | ATtrition Reserve
| Others |
| ATR | Audio Tape Recorder
| Others |
| ATR | Australian Tournament Rankings
| Others |
| ATR | Authorised Ticket Reseller
| Others |
| ATR | Auto Transformer Rectifier
| Others |
| ATR | Autoliv Turkey
| Others |
| ATR | Automated Target Recognition
| Others |
| ATR | Automated Traffic Recorder
| Others |
| ATR | Automatic Locking Retractors
| Others |
| ATR | Automatic Tampon Removal
| Others |
| ATR | Automatic Tampon Remover
| Others |
| ATR | Automatic Target Recognition
| Others |
| ATR | Automatic Terminal Recognition
| Others |
| ATR | Automatic Ticket Resolution
| Others |
| ATR | Automatic Traffic Recorder
| Others |
| ATR | Automatic Transmission Relay
| Others |
| ATR | Automobiles Transport Rapide
| Others |
| ATR | Automotive Tradition
| Others |
| ATR | AutoThermal Reforming
| Others |
| ATR | Autotrack
| Others |
| ATR | Auxiliary Tug and Rescue
| Others |
| ATR | Average Trading Range
| Others |
| ATR | Average Treatment Rate
| Others |
| ATR | Average True Range
| Others |
| ATR | Aviation Training Relocation
| Others |
| ATR | Avion de Transport Regional
| Others |
| ATR | Avions De Transport R
| Others |
| ATR | Avions De Transport Regional
| Others |
| ATR | Avions Transport Regional
| Others |
| ATR | The Ags To Rhic
| Others |
| ATR | Transmission Remanufacturing
| Others |