| Abbreviations | Meaning |
 | LAMSO | Life And Medical Sciences Online [periodical] |
| LAN | Laboratory Automation News |
| LAS | Laboratory And Point-of-Care Testing Accreditation Standards |
| LASA | Laboratory Animal Science Association |
| LASS | Latin American Sleep Society |
| LATRA | LAboratoire De Transcription Et De Recherches Pour Aveugles Et Amblyopes |
| LAVA | Laboratory Animal Veterinary Association |
| LCA | Lung Cancer Alliance |
| LCCE / CLAE | Ligue Canadienne Contre L'épilepsie / Canadian League Against Epilepsy |
| LCCH | London College Of Clinical Hypnosis |
| LCH | Langerhans Cel Histiocytose Belgium. L'Histiocytose De Langerhans |
| LCMHA | Lenawee Community Mental Health Authority |
| LDA | Learning Disabilities Association |
| LDA | Louisiana Dental Association |
| LDAC | Learning Disabilities Association Of Canada. Troubles D'Apprentissage - Association Canadienne |
| LDB | Genetic Location Database |
| LDHA | Louisiana Dental Hygienists Association |
| LDRR | Laboratory Of Diagnostic Radiology Research |
| LE GOëLAND | Association Nationale Du Syndrome X Fragile |
| LEAD | Lead Education Abatement Design Group |
| LEF | Life Extension Foundation |
| LFA | Lupus Foundation Of America |
| LFC / FCL | Lymphoma Foundation Canada / Fondation Canadienne Sur Le Lymphome [Previously: Lymphoma Research Foundation Canada (LRFC) / Fondation Canadienne De Recherche Sur Le Lymphome (FCRL)] |
| LFCD | Ligue Française Contre La Dystonie |
| LFCE | Ligue Française Contre L'Épilepsie |
| LFCN | Ligue Française Contre Les Neurofibromatoses |
| LFN | Libraries For Nursing |
| LGVMA | Lesbian & Gay Veterinary Medical Association |
| LHNCBC | Lister Hill National Center For Biomedical Communications |
| LIDHA | Long Island Dental Hygienists Association |
| LIMBIO | Laboratoire D'Imagerie Moléculaire Et Bioinformatique / Molecular Imaging And Bioinformatics Laboratory |
| LIMNURP | Lippincott Manual Of Nursing Practice |
| LINK | WHO Library And Information Networks For Knowledge. Bibliothèque Et Réseaux D'information à L'appui Des Connaissances De L'OMS |
| LJI | List Of Journals Indexed In Index Medicus |
| LLBA | Linguistics And Language Behavior Abstracts |
| LLCC | Ligue Luxembourgeoise Contre Le Cancer |
| LLL | La Leche League |
| LLLI | La Leche League International |
| LLLT | Low Level Laser Therapy |
| LMSA | Latino Medical Student Association |
| LNC | Legal Nurse Consultant |
| LNCC | Ligue Nationale Contre Le Cancer |
| LOCIS | Library Of Congress Information System |
| LOEX | Laboratoire D'Organogénèse Expérimentale. Laboratory Of Experimental Tissue Engineering |
| LONI | Library Of Neuropsychological Information |
| LOPEX | Laboratoire D'Orthopédogénèse Expérimentale |
| LOPNEX | Laboratoire D'Organogénèse Pneumologique Expérimentale |
| LRDT | Laboratory Of Reproductive And Developmental Toxicology |
| LRF | Leukemia Research Foundation |
| LRF | Lymphoma Research Foundation |
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