- L, L-1, L-2, L-3 — Lewisite
- La Crosse Virus Infection
- Lab Measurements in People — see Biomonitoring
- Lab Safety at CDC
- Laboratory Biosafety Publication
- Laboratory Leadership Service
- Laboratory Medicine Quality Improvement
- Laboratory Response Network (LRN) Data Exchange Services
- Laboratory Training
- Lassa Fever
- Law, Public Health — see Public Health Law
- Lead
- Lead Poisoning
- Learn the Signs, Act Early Campaign
- Learning Connection — see CDC Learning Connection
- Legionella, Controlling
- Legionella, Investigating
- Legionellosis — see Legionnaires’ Disease
- Legionnaires’ Disease
- Legislation and Regulation
- Leishmania Infection — see Leishmaniasis
- Leishmaniasis
- Leprosy — see Hansen’s Disease
- Leptospira Infection — see Leptospirosis
- Leptospirosis
- Lewisite
- Library
- Lice
- Lice, Body — see Body Lice
- Lice, Head — see Head Lice
- Lice, Pubic — see Pubic Lice
- Life Expectancy
- Life Stage Statistics
- Lipoprotein (a)
- Lipoprotein (a)
- Listeria Infection
- Listeriosis — see Listeria Infection
- Liver Cancer
- Liver Disease and Hepatitis — see Viral Hepatitis
- Liver Flukes
- Loiasis — see Filarial Worms
- Long Work Hours — see Work Schedules
- Long-Acting Anticoagulant — see Super Warfarin
- Long-Term Care Facilities, Infection Prevention in (LTCFs)
- Louse-borne Relapsing Fever — see Tick and Louse-borne Relapsing Fevers
- Lujo Hemorrhagic Fever (LUHF)
- Lung Cancer
- Lupus (SLE)
- Lyme Disease
- Lymphatic Filariasis — see Filarial Worms
- Lymphedema
- Lymphocytic Choriomeningitis (LCM)
- Lynch Syndrome
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