LTI

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