In biology, Twins are two or more siblings which gestated and were born together. Types of biological twins include:

• Fraternal twins
• Identical twins
• Multiple births, while not necessarily twins, are sometimes referred to as "multiple twins".
• Conjoined twins, or Siamese
• Parasitic twin, a very rare condition caused by a variety of circumstances
• Twin can also refer to a doppelgänger or clone.

See also: Category:Multiple births

Twin also refers to a pair of associated similar objects or concepts:

• Town twinning, two distant cities that agree to partner each other, for various reasons
• Twin boundary, where two crystallites which share atoms at repeated intervals and have only a minor difference in orientation meet at
• Twin cities, two towns or cities that are geographically close to each other, and often referred to collectively. The term is most often used to describe the Minneapolis-St. Paul metropolitan area in Minnesota, United States. Other examples include the Twin Ports of Duluth, Minnesota and Superior, Wisconsin, United States.
• Twin prime, a prime number that differs from another prime number by two
• Twin Towers are any of a number of matching structures, most notably the former World Trade Center in New York City

Twin or Twins may also refer to:

• First Twin and Second Twin, the twin lost boys in J.M. Barrie's Peter Pan
• Minnesota Twins of Major League Baseball, which take their name from the Twin Cities of Minneapolis and St. Paul
• Twin (computing), a Text WINdows computer interface
• Twin (mythology), a very common theme in mythology
• TWIN (music producer),a music production Team
• Twin, a standard bed, mattress, or sheet size
• Twin paradox, a thought experiment in special relativity
• Twins (album), the name of Twins self-titled album
• Twins (band), a Hong Kong-based Cantopop musical group
• Twins (film), a 1988 comedy film starring Arnold Schwarzenegger and Danny DeVito
• Twins (1925 film), a 1925 film starring Stan Laurel
• Twins (pornographic film), the name of two gay pornographic movies, one starring the O'Brien Twins, Christy twins and Karisdtadt Twins, and the other starring the Oddyssey Twins
• Twins (The Matrix), characters from The Matrix Reloaded
• Twins (TV series), a sitcom that debuted on The WB Television Network in September 2005
• Twins, a photobook by Steven Underhill
• Twins, a song by Manitoba from their 2003 album, Up in Flames
• TWINS (Knock Out), a song by Super Junior from their 2005 album, Super Junior 05

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