- logarithmic coordinates
- logarithmic decrement
- loggia
- logging
- logging site
- logic probe
- logical device
- logical model
- logical value
- logway
- long bench
- locomotive run
- lodge
- loess material
- log crib
- log off
- log slip
- log truck
- logic analyzer
- logic error
- logic level
- logical variable
- long arc
- long beam
- long bend
- longitudinal shed
- longitudinal skylight
- longitudinal slope
- longitudinal stiffener
- longitudinal stiffness
- longitudinal strain
- longitudinal stress
- lonic order
- lookout
- loop
- loop street
- loop tunnel
- loop vent
- looped tunnel
- looping
- loose
- loose aggregate
- loose ashes
- loose body
- loose cut
- loose earth
- loose fill
- loose flange
- loose knot
- loose lintel
- loose masonry
- loose material
- loose roof
- loose sand
- loose soil
- loose tongue
- loosen
- looseness
- loosening
- lop
- lopoliths lopolit
- local stability
- local stress
- locality plan
- locator
- lock block
- lock canal
- lock contact
- lock gates
- lock knob
- lock nut
- lock paddle
- lock rail
- lock saw
- lock sill
- lock wall
- lockage loss
- locking device
- locking moment
- lockset
- locomotive shed
- loess loam
- loessial clay
- log boom
- log dressing
- log flooring
- log house
- log out
- log wall
- logarithmic scale
- logging equipment
- logging tongs
- logical operation
- logical structure
- logically
- long borer
- long column
- long screw
- long stand
- long-boat