China 
Africa 
- Laser diodes
- Laser doppler velocimetry
- Laser doppler vibrometer
- Laser drilling
- Laser dye
- Laser engraving
- Laser ignition
- Laser level
- Laser linewidth
- Laser medicine
- Laser metal deposition
- Laser peening
- Laser photocoagulation
- Laser pointers
- Laser pumping
- Laser rangefinder
- Laser safety
- Laser scanning
- Laser shock
- Laser surgery
- Laser trackers
- Laser trimming
- Laser ultrasonics
- Laser weapons
- Laser welding
- Laser-heated pedestal growth
- Laser-hybrid welding
- Laser-induced fluorescence
- Lasing threshold
- Lasing without inversion
- Lassa fever
- Lasso
- Last Glacial Maximum
- Last glacial period
- Last ice age
- Last mile
- Latch-up
- Latches
- Late glacial
- Latency
- Latent
- Latent class model
- Latent heat
- Latent period
- Latent semantic analysis
- Latent space
- Latent tuberculosis
- Latent variable model
- Latent variables
- Lateral earth pressure
- Lateral epicondyle of the femur
- Lateral epicondyle of the humerus
- Lateral force variation
- Lateral geniculate nucleus
- Lateral hypothalamus
- Lateral inhibition
- Lateral lemniscus
- Lateral line
- Lateral meniscus
- Lateral pterygoid muscle
- Lateral strain
- Lateral sulcus
- Lateral thinking
- Lateral ventricle
- Lateral ventricles
- Laterality
- Laterite
- Latex
- Latex agglutination
- Latex allergy
- Lath
- Lath and plaster
- Lathe
- Latin Hypercube Sampling
- Latin rectangle
- Latin squares
- Latissimus dorsi
- Latite
- Latitude
- Latitude on
- Latrunculin
- Lattice boltzmann methods
- Lattice constant
- Lattice energy
- Lattice gas automata
- Lattice girder
- Lattice graph
- Lattice model
- Lattice of subgroups
- Lattice problem
- Lattice reduction
- Lattice-based cryptography
- Lattices
- Laughter
- Laumontite
- Launch vehicles
- Launching gantry
- Laurent polynomial
- Laurent series
- Lauric acid
- Laurolactam
- Lava
- Lava channels
- Lava fields
- Lava tubes
- Lavage
- Lavatory
- Laves phases
- Law of cosines
- Law of definite proportions
- Law of large numbers
- Law of mass action
- Law of multiple proportions
- Law of sines
- Law of superposition
- Law of the iterated logarithm
- Law of the wall
- Law of thermodynamics
- Law of total probability
- Law of total variance
- Lawn mower
- Lawrencium
- Lawson criterion
- Lawsonite
- Lax equivalence theorem
- Lay-up process
- Layer
- Layered double hydroxides
- Layered materials
- Layers
- Layers of Protection Analysis
- Layout
- Layout extraction
- Layout versus schematic
- Layshaft
- Lazy evaluation
- Lazy learning
- Lbf
- Le Chatelier's principle
- Leachate
- Lead
- Lead abatement
- Lead arsenate
- Lead azide
- Lead carbonate
- Lead chloride
- Lead chromate
- Lead citrate
- Lead compound
- Lead compounds