| Acronym | Definition |
|---|
| LTR | Letter |
| LTR | Later |
| LTR | Long Terminal Repeat |
| LTR | Long Term Relationship |
| LTR | Left to Right |
| LTR | letter size (US Postal Service) |
| LTR | Low Thermal Resistance |
| LTR | Littlerock (Amtrak station code; Littlerock, CA) |
| LTR | Likelihood to Recommend (market research surveys) |
| LTR | Language Temps Reel |
| LTR | Learn to Ride (snowboarding) |
| LTR | Local Twitch Respons (skeletal muscle fibers) |
| LTR | Learn to Read (education) |
| LTR | Load Task Register |
| LTR | Learn to Row (rowing instruction) |
| LTR | Logic Trunked Radio (trunked two-way radio) |
| LTR | Long Term Research |
| LTR | Lifetime Risk |
| LTR | Loop Transfer Recovery |
| LTR | Library Technology Reports (American Library Association publication) |
| LTR | Light Tactical Rifle (gun) |
| LTR | Long Term Romance |
| LTR | Laser Tracker Receiver (Apache attack helicopter) |
| LTR | Learn To Return |
| LTR | Leisure Tyme Rentals, Inc. (Albemarle, NC) |
| LTR | Little Theatre of the Rockies |
| LTR | Lower Troposphere Radar |
| LTR | Loss of Therapeutic Response (drug efficacy) |
| LTR | Love Trust Respect |
| LTR | Level Term Rider (life insurance) |
| LTR | Lady To Ride |
| LTR | Licensing Topical Report |
| LTR | Long Term Requirement |
| LTR | Land Tenure Regularisation |
| LTR | Long-Term Return Rate (TL 9000) |
| LTR | Lower Trunk Rotation (physical therapy) |
| LTR | Light Tactical Raft |
| LTR | Laser Transmitter Receiver (LANTIRN) |
| LTR | Licensing Topical Reports |
| LTR | Lead Technical Representative |
| LTR | Light Transmission Ratio |
| LTR | Laser Target Rangefinder |
| LTR | Long-Term Recall (neuropsychology) |
| LTR | Loving Tender Relationship |
| LTR | Local Transaction Request (computer processing) |
| LTR | Logistics Training Review |
| LTR | Lossless Trace Reduction |
| LTR | Local Travel Report (AMSEC) |
| LTR | Loan against Trust Receipts |
| LTR | Lepidoptera of Turkey (Centre for Entomological Studies Ankara project) |