Lemming

Lemniscate of Bernoulli

Lemon

Length

Lens (optics)

Lentil

Lenz's law

Leo

Lepidodendrales

Lepidolite

Lepidoptera

Lepidosauria

Lepisosteiformes

Lepospondyli

Leprosy

Leptin

Lepton

Leptospirosis

Leptostraca

Lespedeza

Lethal dose 50

Lethal gene

Lettuce

Leucite rock

Leukemia

Level measurement

Lever

Libra

Lichens

Licorice

Lidar

Lie detector

Lie group

Life during Snowball Earth

Life forms of plants

Life zones

Life-cycle analysis of civil structures

Ligament

Ligand

Ligand field theory

Light

Light amplifier

Light curve

Light panel

Light pollution

Light rail and transport policies

Light-emitting diode

Light-scattering techniques

Light-year

Lighthouse

Lightning

Lightning and surge protection

Lignin

Lignin-degrading fungi

Lignite

Lignumvitae

LIGO (Laser Interferometer Gravitational-wave Observatory)

Likelihood of eastward mountain lion dispersal in North America

Liliales

Liliidae

Liliopsida

Limb identity during development

Lime (botany)

Lime (industry)

Limestone

Limitations on increasing cellular system data rates

Limiter circuit

Limits and fits

Limnology

Limonite

Line integral

Line spectrum

Linear algebra

Linear energy transfer (biology)

Linear momentum

Linear programming

Linear system analysis

Linear systems of equations

Linearity

Linen

Lines of force

Linewidth

Linguistics

Lingulida

Link

Linkage (genetics)

Linkage (mechanism)

Lipid

Lipid metabolism

Lipid rafts (membranes)

Lipidomics

Lipoprotein

Liposomes

Liquefaction of gases

Liquefied natural gas (LNG)

Liquefied natural gas as a marine fuel

Liquefied petroleum gas (LPG)

Liquid

Liquid chromatography

Liquid crystals