IS can refer to:
Israel (; Hebrew: יִשְׂרָאֵל, Arabic: إِسْرَائِيل), officially the State of Israel (Hebrew: מְדִינַת יִשְׂרָאֵל, Arabic: دَوْلَة إِسْرَائِيل), is a country in the Middle East, on the southeastern shore of the Mediterranean Sea and the northern shore of the Red Sea.
Islam () is an Abrahamic monotheistic religion teaching that there is only one incomparable God (Allah) and that Muhammad is the messenger of God.
The Islamic State of Iraq and the Levant (ISIL, IPA: ), also known as the Islamic State of Iraq and Syria (ISIS ), Islamic State (IS), and by its Arabic language acronym Daesh (Arabic: داعش dāʿish, IPA: [ˈdaːʕɪʃ]), is a Salafi jihadist militant group and unrecognised proto-state that follows a fundamentalist, Wahhabi doctrine of Sunni Islam.
Istanbul (UK: , or US: ; Turkish: İstanbul [isˈtɑnbuɫ]), historically known as Constantinople and Byzantium, is the most populous city in Turkey and the country's economic, cultural, and historic center.
The Isle of Man (; Manx: Mannin [ˈmanɪn] or Ellan Vannin [ˈɛlʲən ˈvanɪn]), also known simply as Mann, is a self-governing Crown dependency in the Irish Sea between the islands of Great Britain and Ireland.
Sir Isaac Newton PRS (; 25 December 1642 – 20 March 1726/27) was an English mathematician, astronomer, and physicist (described in his own day as a "natural philosopher") who is widely recognised as one of the most influential scientists of all time and a key figure in the scientific revolution.
ISO 8601 Data elements and interchange formats – Information interchange – Representation of dates and times is an international standard covering the exchange of date and time-related data.
The Islamic, Muslim, or Hijri calendar (Arabic: التقويم الهجري at-taqwīm al-hijrī) is a lunar calendar consisting of 12 months in a year of 354 or 355 days.
Isaac Asimov (; born Isaak Ozimov; c. January 2, 1920 – April 6, 1992) was a Russian-American writer and professor of biochemistry at Boston University.