| ALT | Abundant Larval Transcript 
| Others |
| ALT | Accelerated Life Testing
| Others |
| ALT | Achievement Level Tests
| Others |
| ALT | Acquisition, Logistics, and Technology
| Others |
| ALT | Active Leap Technology
| Others |
| ALT | Adaptive Lighting Technology
| Others |
| ALT | Administrative Lead Time
| Others |
| ALT | Advanced Learning Technologies
| Others |
| ALT | Advanced Logic Technology
| Others |
| ALT | Alanine Transaminase
| Others |
| ALT | Algorithmic Learning Theory
| Others |
| ALT | Alt Linux Team
| Others |
| ALT | Alternate
| Others |
| ALT | Alternating
| Others |
| ALT | Alternative Lengthening of Telomeres
| Others |
| ALT | Alternative Method
| Others |
| ALT | Alternator
| Others |
| ALT | ALTimeter
| Others |
| ALT | Altitude
| Others |
| ALT | Amino Alanine Transferase
| Others |
| ALT | Analogue Loopback Transfer
| Others |
| ALT | Anarchists Lunatics and Terrorists
| Others |
| ALT | Anarchists, Lunatics, and Terrorists
| Others |
| ALT | Angelic Light Transmissions
| Others |
| ALT | Anterolateral Thigh
| Others |
| ALT | Anti Labour Technican
| Others |
| ALT | Application Load Table
| Others |
| ALT | Approach and Landing Test
| Others |
| ALT | Argon Laser Trabeculoplasty
| Others |
| ALT | Arte Lavoro Territorio
| Others |
| ALT | Arts Lecture Theatre
| Others |
| ALT | Assembly Line Type
| Others |
| ALT | Assistant Language Teacher
| Others |
| ALT | Association for Learning Technology
| Others |
| ALT | Association for Linguistic Typology
| Others |
| ALT | Association Leadership Team
| Others |
| ALT | Atypical lipomatous tumours
| Others |
| ALT | Automated Loop Test
| Others |
| ALT | Automatic Link Transfer
| Others |
| ALT | Aveo Lt
| Others |
| ALT | WordPerfect Library Menu file
| Others |