LSST

LSST may refer to:


 * Large Synoptic Survey Telescope, former name of the Vera C. Rubin Observatory astronomical observatory in Chile
 * Legacy Survey of Space and Time, an astronomical survey performed at the Vera C. Rubin Observatory
 * Lowstand systems tract, a type of sedimentary deposit in sequence stratigraphy
 * The Priory Academy LSST, formerly Lincoln School of Science and Technology, a school in Lincolnshire, England, UK
 * Legal Services Support Team, units of the United States Marine Corps Judge Advocate Division