| Acronym | Definition |
|---|
| LOI | Letter of Indemnity (international trade and carriage business) |
| LOI | Letter Of Intent |
| LOI | Lack Of Information |
| LOI | List Of Items |
| LOI | Letter of Inquiry |
| LOI | Level of Importance |
| LOI | Level of Independence |
| LOI | Loss On Ignition |
| LOI | Letter of Invitation |
| LOI | League of Ireland (Irish soccer league) |
| LOI | Line of Inquiry |
| LOI | Level of Intervention |
| LOI | List of Illustrations |
| LOI | Lack of Intelligence |
| LOI | Letter of Investigation |
| LOI | Limiting Oxygen Index |
| LOI | Location of Injury (medicine) |
| LOI | Law on Investment (various locations) |
| LOI | Limit of Indemnity (insurance) |
| LOI | Limit of Identifictation (chemistry) |
| LOI | Lament of Innocence (video game) |
| LOI | La Oferta Irresistible (Spanish: The Irresistible Offer; Uruguay) |
| LOI | Lodge of Instruction (Masonic lodge) |
| LOI | Level of Interoperability (various organizations) |
| LOI | Loss of Imprinting (oncology) |
| LOI | Lunar Orbit Insertion |
| LOI | Local Operator Interface |
| LOI | Length of Interview (surveys) |
| LOI | Lack of Interest |
| LOI | Level of Interactivity (software) |
| LOI | Life Outreach International |
| LOI | Laughing on the Inside |
| LOI | Loyal Orange Institution (religious group) |
| LOI | Location of Interest |
| LOI | Loss Of Input |
| LOI | Limited Over International |
| LOI | Leyton Obsessional Inventory |
| LOI | Loan Origination Interface (software) |
| LOI | Line Oriented Interview (airlines) |
| LOI | Letter Of Instruction/Interest |
| LOI | Lending One, Inc. |
| LOI | Living Ocean International |