- lattice-ordered semigroup
- lattice-ordered simple group
- lattice-ordered space
- lattice point
- lattice point in circle problem
- lattice point in sphere problem
- lattice-point problem
- Lattice-point problem
- lattice polynomial
- lattice ring
- lattice semiring
- latus rectum
- Laurent expansion
- Laurent matrix
- Laurent operator
- Laurent series
- Laurent theorem
- Laval nozzle
- law of a closed system
- law of action and reaction
- law of areal velocity
- law of basic operation
- law of basic order of natural numbers
- law of conservation of charge
- law of contradiction