TW or tw may refer to:
Twitter () is an American online news and social networking service on which users post and interact with messages known as "tweets".
Two and a Half Men is an American television sitcom that originally aired on CBS for twelve seasons from September 22, 2003, to February 19, 2015. Originally starring Charlie Sheen, Jon Cryer, and Angus T.
Twin Peaks is an American mystery horror drama television series created by Mark Frost and David Lynch that premiered on April 8, 1990, on ABC.
Trans World Airlines Flight 800 (TWA 800) was a Boeing 747-100 that exploded and crashed into the Atlantic Ocean near East Moriches, New York, on July 17, 1996, at about 8:31 p.m.
Twelver (Arabic: اثنا عشرية, translit. Athnā‘ashariyyah or Ithnā‘ashariyyah; Persian: شیعه دوازدهامامی, pronounced [ʃiːʔe-je dævɑzdæh emɑmiː]) or Imamiyyah (Arabic: إمامية) is the largest branch of Shia Islam.
Two's complement is a mathematical operation on binary numbers, and is an example of a radix complement.
Twelfth Night, or What You Will is a comedy by William Shakespeare, believed to have been written around 1601–1602 as a Twelfth Night's entertainment for the close of the Christmas season.