| Acronym | Definition |
|---|
| LIR | Labor and Industrial Relations (various organizations) |
| LIR | Local Internet Registry |
| LIR | Loi Concernant l'Impôt sur le Revenu (French: Income Tax Law; Luxembourg) |
| LIR | Load Instruction Register |
| LIR | Lithium Ion Recharge |
| LIR | Let It Rip |
| LIR | Location Information Request |
| LIR | Library Instruction Room (various locations) |
| LIR | Laboratory Investigation Report |
| LIR | Laboratoires Internationaux de Recherche (International Research Laboratories Association) |
| LIR | Lexicon Istoric Retic (Swiss encyclopedia) |
| LIR | Line Item Review (various organizations) |
| LIR | Ley del Impuesto A La Renta (Spanish: Income Tax Law) |
| LIR | Liberia, Costa Rica - Liberia (Airport Code) |
| LIR | London Irish Rifles (UK regiment) |
| LIR | Location Inventory Report |
| LIR | Laboratory Implementation Requirements |
| LIR | Laser Incident Report |
| LIR | Link Incident Report (Cisco) |
| LIR | Low Intermediate Representation |
| LIR | Load Instruction Report |
| LIR | Lateral Impulse Reaction |
| LIR | Lepidoptera of Iran |