- left inverse
- left justify
- left parenthesis
- left shift
- left-aligned
- left-justified
- legacy
- legal contract
- legal pleading
- legal retrieval
- legal software
- legend
- leisure software
- LEN node
- lenticular beam
- lenticular truss
- layer
- layer capacitance
- layer index
- layered architecture
- layered interface
- layered routing
- layering
- layout object
- layout process
- layout structure
- lead edge
- lead position
- leader character
- leader label
- leading decision
- leading edge
- leading effect
- leading light
- leading variable
- leading whitespace
- leakage
- leapfrog test
- learning machine
- least
- LED printer
- left derivative
- left factorization
- left justification
- left section
- left-adjust
- leftmost position
- less
- letter buttons
- letter head
- letter row
- letter-quality
- lettering
- level compensator
- level converter
- level diagram
- level drift
- level separation
- level set
- levy
- lexical structure
- lexical token
- lexicographic order
- LHarc
- liability
- liberate
- liberation
- librarian
- librarian program
- library block
- library case
- library disc
- library function
- library member
- library migration
- library object
- library routine
- library science
- library subroutine
- library system
- libration
- licence
- license
- license agreement
- license free
- licensed documentation
- Lie algebra
- life cycle
- learning
- learning rule
- least residue
- left column
- left invariant
- left pane
- left side
- left-hand
- legal
- lemniscate
- lengthened
- lens space