LTSA

LTSA may refer to:


 * Local tangent space alignment, a nonlinear dimensionality reduction method
 * Land Title and Survey Authority in British Columbia, Canada
 * Land Transport Safety Authority, a former government entity in New Zealand, preceding Land Transport New Zealand
 * Latin Tropical/Salsa Airplay, a Billboard music chart
 * Lyceum Tourism Students Association, of Lyceum of the Philippines University
 * Labelled Transition System Analyser, a verification tool for concurrent computer systems
 * Long Term Service Agreement, an agreement to provide service over a number of years
 * Last Time Seen Alive