LST is a three-character initialism that may refer to:
- Landing Ship, Tank, a U.S. Navy ship class, of type Amphibious Warfare
- Laplace-Stieltjes transform, a transform similar to the Laplace transform
- Launceston Airport
- Least slack time scheduling
- Linux Support Team, a defunct German company and Linux distribution
- Living Systems Theory
- Local Sidereal Time
- London School of Theology
- Löwenheim–Skolem theorem, a theorem in first-order logic dealing with the cardinality of models
- The Station Code for London Liverpool Street