Labradorite

Labyrinthulia

Lacquer

Lacrimal gland

Lactam

Lactate

Lactation

Lactone

Lagomorpha

Lagrange's equations

Lagrangian function

Lake

Lamiales

Laminar flow

Laminariales

Lamniformes

Lamp

Lampriformes

Lamprophyre

Land drainage (agriculture)

Land reclamation

Land-use class

Land-use planning

Landing gear

Landscape architecture

Landscape ecology

Landslide

Langevin function

Langmuir circulation

Language theory

Lanolin

Lanthanide contraction

Lanthanum

Laplace transform

Laplace's differential equation

Laplacian

Larch

Large Hadron Collider (LHC)

Large Hadron Collider: first year

Large Kuiper Belt objects

Large systems control theory

Larmor precession

Larnite

Larynx

Larynx disorders

Laser

Laser alloying

Laser cooling

Laser cooling of solids

Laser marking

Laser Microjet technology

Laser photobiology

Laser photochemistry

Laser spectroscopy

Laser welding

Laser-solid interactions

Laser-ultrasonic cavitation

Lateral line system

Lateral meristem

Laterite

Latest Paleocene thermal maximum

Latitude and longitude

Lattice (mathematics)

Lattice quantum chromodynamics

Lattice vibration

Launch complex

Laurales

Lava

Law of combining volumes

Lawn and turf grasses

Lawrencium

Lawson criterion

Lawsonite

Layered intrusion

Layout drawing

Lazurite

Le Châtelier's principle

Leaching

Lead

Lead alloys

Lead isotope geochemistry

Lead metallurgy

Lead systems integrator

Leaf

Leaf senescence and autumn leaf coloration

LEAFY as a master regulator of flower development

Lean manufacturing

Learning

Least-action principle

Least-squares method

Leather and fur processing

Lecanorales

Lectins

Lecythidales

LED roadway lighting: the Los Angeles conversion project

Legendre functions

Legionnaires' disease

Legume

Legume forages

Leitneriales