| Acronym | Definition |
|---|
| LO | Little One (child) |
| LO | Left Out |
| LO | Hello |
| LO | Law and Order |
| LO | Loved One |
| LO | Lights Out |
| LO | Loan Officer |
| LO | Learning Object |
| LO | Liceum Ogolnoksztalcace (Polish high school) |
| LO | Lamar Odom (basketball player) |
| LO | Lay Out (design) |
| LO | Slovakia |
| LO | Lecco (Italy) |
| LO | Log Out |
| LO | Local Oscillator |
| LO | Learning Organization |
| LO | Lake Oswego (Oregon) |
| LO | Learning Outcome (education) |
| LO | Liaison Officer |
| LO | Polish Airlines (IATA airline code) |
| LO | Landsorganisationen (central organization for the Swedish Worker's Trade Unions) |
| LO | Landsorganisasjonen |
| LO | Lake Orion (Michigan city) |
| LO | Lutte Ouvrière (French: Workers' Struggle, Reunion) |
| LO | Locals Only (surfing slang) |
| LO | Landsorganisationen I Sverige (Swedish trade union) |
| LO | Lease Option |
| LO | Lesson Objective (education) |
| LO | Lichamelijke Opvoeding |
| LO | Level Off |
| LO | Lubricating Oil |
| LO | Liquid Oxygen |
| LO | Learning Objective |
| LO | Low Observable |
| LO | Lodi, Lombardia (Italian province) |
| LO | Landelijke Organisatie (Dutch) |
| LO | Lunar Orbit |
| LO | Lager Onderwijs |
| LO | Lubrication Order |
| LO | Life Orientation |
| LO | Line Office |
| LO | Laser Optics |
| LO | Leave Without Pay |
| LO | Landscape Ontario (Canada) |
| LO | Lysyl Oxidase |
| LO | Lao Language (language code; International Organization for Standardization) |
| LO | Locked Open |
| LO | Local Optimization |
| LO | Lyra's Oxford (Phillip Pullman book) |
| LO | Left Oophorectomy (gynecology) |
| LO | Licensed Optician |
| LO | Liner Out (shipping) |
| LO | Letter Orders |
| LO | Line of Operation |
| LO | Light Offense (gaming) |
| LO | Leadership Oakland (Troy, Michigan) |
| LO | Liquid Oxidation |
| LO | Laboratory Outfitting |
| LO | Low Nuc Inbackhaul Check (airfare construction) |
| LO | Landsorganisatie (Dutch) |
| LO | Carriers' Official Stamp (Scott Catalogue prefix; philately) |