LSI

LSI may refer to:

Science and technology

 * Large-scale integration, integrated circuits with tens of thousands of transistors
 * Latent semantic indexing, a technique in natural language processing
 * LSI-11, an early large-scale integration computer processor that implemented the DEC PDP-11 instruction set
 * Langelier saturation index, a measure for water's tendency to form scale
 * Linear shift-invariant systems, the discrete equivalent of linear time-invariant systems

Organizations

 * LSI Corporation, a technology company founded in 1981 as LSI Logic Corporation
 * Lynch Syndrome International, non-profit organisation supporting those affected by Lynch Syndrome
 * Labour and Socialist International, a multinational federation of left wing political parties and trade unions active between 1923 and 1940
 * Socialist Movement for Integration (Lëvizja Socialiste për Integrim), a political party in Albania
 * Lear Siegler Incorporated, a technology company active from 1961 to 2002
 * Lingkaran Survei Indonesia, a survey company in Indonesia

Transportation

 * Lake Superior and Ishpeming Railroad, a railroad service in Michigan, United States
 * Sumburgh Airport (IATA airport code) in Shetland, Scotland

Music

 * "LSI (Love Sex Intelligence)", a single by The Shamen
 * Long-string instrument, a musical instrument

Other uses

 * Landing ship, infantry, a type of troopship or post World War II a landing craft
 * La Salle Institute, a college preparatory school
 * Linguistic Survey of India, a survey of the languages of British India directed by G.A. Grierson
 * Logical Sensory Introvert, a socionics type
 * Lighting & Sound International, a trade magazine