LSI

LSI may mean

• Lord Steel Industry, a manufacturer of stainless steel tubing and piping
• Labour and Socialist International, a former socialist international
• Lake Superior and Ishpeming Railroad, a railroad service in Michigan, U.S.
• Landing Ship, Infantry, a type of troopship or post WWII a landing craft
• Langelier Saturation Index, a measure for water's tendency to form scale
• Large Scale Integration, integrated circuits with tens of thousands of transistors
• La Salle Institute, a college preparatory school
• Latent semantic indexing, a technique in natural language processing
• Lear Siegler Inc., a technology company active from 1961-2002
• Lëvizja Socialiste për Integrim, an Albanian political party
• Linear shift-invariant systems, the discrete equivalent of linear time-invariant systems
• Linguistic Survey of India, a survey of the languages of British India directed by G.A. Grierson
• Logical Sensory Introvert, a socionics type
• Long string instrument, a musical instrument
• The LSI-11, an early large-scale integration computer processor that implemented the DEC PDP-11 instruction set
• LSI Corporation, a technology company founded in 1981
• "LSI (Love Sex Intelligence)", a single by The Shamen
• Sumburgh Airport (IATA airport code), the main airport serving Shetland in Scotland