SIL, Sil and sil may refer to:

In organizations:

  • State Informatics Limited (SIL) is a Systems Integrator in Mauritius and a leading ICT company in Africa.
  • SIL International, a global Christian non-profit organization that studies lesser-known languages.
  • SIL, formerly the American Stock Exchange ticker symbol for Apex Silver Mines.
  • Societas Internationalis Limnologiae, former name for the International Society of Limnology.
  • Society for Individual Liberty, later part of the International Society for Individual Liberty.
  • Scooters India Limited, formed when the Indian government purchased Lambretta.
  • Southwest International League, a defunct American minor league baseball league.

In science and technology:

  • Solid immersion lens, a device usually used in optical microscopy.
  • Standard Interchange Language, a language standard used for the information exchange between software.
  • Software-in-the-Loop, a method used in regression testing.
  • Sil, a vector drawing program for the Xerox Star computer system.
  • SIL, an alternate symbol for the human gene STIL.
  • Surge impedance loading, a physical property of electrical transmission lines.
  • Squamous intraepithelial lesion, abnormal tissue situated within a squamous epithelium.
  • Safety Integrity Level, a measurement of performance required for a Safety Instrumented Function.
  • Speech Interference Level, an acoustical parameter.
  • Stable Isotope Labelling e.g. SILAC.

In fiction:

  • Sil (Doctor Who), a villain from the British science-fiction series Doctor Who.
  • Sil, a character in the film Species.
  • Silvio Dante, a character on The Sopranos.

In people:

  • Narasingha Sil, historian.
  • Sil Campusano, a former Major League Baseball player.
  • Sil Austin, a jazz saxophonist.
  • Sil, a member of the Dutch rap-metal band Urban Dance Squad.
  • Sil, Minor Lastname in Poland 35-50 persons

Other uses:

  • Sil (river), a river in Galicia, Spain.
  • Sile (river), also called the "Sil", in Italy.
  • SIL code, a three-letter language code used in SIL International's Ethnologue.
  • sil, the ISO 639-3 language code for Tumulung Sisaala.
  • South Island Line, a plan of MTR Hong Kong.
  • Safety Integrity Level, a measure of performance required for a safety instrumented system.
  • Silverstone Circuit, an English motor racing circuit.
  • Son-in-law or sister-in-law, in on-line and text messaging usage.
  • Sing it Loud, an American pop rock band.
  • Silence-Lotto, the UCI code for the professional road bicycle racing team.
  • Nissan Silvia, short/slang name for the Nissan Silvia series.