IS can refer to:
Israel (; Hebrew: יִשְׂרָאֵל; Arabic: إِسْرَائِيل), officially the State of Israel, 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 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 or Islamic State of Iraq and al-Sham (ISIS ), Islamic State (IS) and by its Arabic language acronym Daesh (Arabic: داعش dāʿish, IPA: [ˈdaːʕɪʃ]), is a Salafi jihadist terrorist organisation and former unrecognised proto-state that follows a fundamentalist, Salafi doctrine of Sunni Islam.
The Isle of Man (Manx: Ellan Vannin [ˈɛlʲən ˈvanɪn]), also known simply as Mann (; Manx: Mannin [ˈmanɪn]), is a self-governing British Crown dependency in the Irish Sea between the islands of Great Britain and Ireland.
Istanbul (UK: , or US: or ; Turkish: İstanbul [isˈtɑnbuɫ] ( listen)), historically known as Constantinople and Byzantium, is the most populous city in what is modern-day Turkey and the country's economic, cultural, and historic center.
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.
Sir Isaac Newton (; 25 December 1642 – 20 March 1726/27) was an English mathematician, astronomer, theologian, author 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.
Isaac Asimov (; c. January 2, 1920 – April 6, 1992) was an American writer and professor of biochemistry at Boston University.