| O | Lab on a Chip | Others | |
| O | Laboratory Assessor for Hong Kong Accreditation Service for assessing laboratories on the testing of GM food | Others | |
| O | Laboratory for COmputational Design, Crystal Education | Others | |
| O | Laboratory Inspection Team for Clinical Microbiology and Infection | Others | |
| O | Laboratory Management Committee (Clinical Microbiology Laboratory, Queen Mary Hospital) | Others | |
| O | Laboratory Practice, International Society of Cell Therapy | Others | |
| O | Lady Helen Woo Women's Diagnostic and Treatment Centre, Tsan Yuk Hospital | Statutory | |
| O | Lai YIn Association | Others | |
| O | Lam Tai Fai Secondary School | Others | |
| O | Lancaster University | Others | |
| O | Lancet Comission on Long Term Care for Older People | Others | |
| O | Lancet Commission on Diagnostics | Others | |
| O | Land and Building Advisory Committee | Others | |
| O | Land and Building Advisory Committee, HKSAR | Others | |
| O | Land and Building Advisory Committee, Housing, Planning and Lands Bureau | Others | |
| O | Land and Building Advisoty Committee | Others | |
| O | Land and Development Advisory Committee | Non-Statutory | |
| O | Land and Development Advisory Committee, HKSAR Government | Non-Statutory | |
| O | Land and Development Advisory Committee, HKSAR Govt | Others | |
| O | Land Development Advisory Committee | Others | |
