LTI can refer to:

  • LTI – Lingua Tertii Imperii, a book by Victor Klemperer
  • Language Technologies Institute, a division of Carnegie Mellon University
  • Linear time-invariant system, an engineering theory that investigates the response of a linear, time-invariant system to an arbitrary input signal
  • Licensed to Ill, the 1986 debut album by the Beastie Boys
  • Lost Time Incident or industrial injury or Occupational injury
  • Learning Tools Interoperability
  • Louisiana Training Institute-East Baton Rouge, later known as the Jetson Center for Youth (JCY), a juvenile prison in Louisiana

Companies

  • London Taxis International
  • Larsen & Toubro Infotech

Biology and medicine

  • Lymphoid tissue-inducer cell, see innate lymphoid cells