Taipei 101 ( ) is a 101-floor landmark skyscraper located in Taipei, Taiwan . The building, designed by C.Y. Lee & Partners and constructed by KTRT Joint Venture, is the world's tallest completed skyscraper. Taipei 101 received the Emporis Skyscraper Award in 2004. It has been hailed as one of the Seven New Wonders of the World ( Newsweek magazine, 2006) and Seven Wonders of Engineering (Discovery Channel, 2005).

The building stands as an icon of Taipei and Taiwan as a whole. Its postmodern style combines tradition and modernity in ways that make it Asian and international both at once. Its safety features enable it to withstand typhoons and earthquakes. A multi-level shopping mall adjoining the tower houses hundreds of fashionable stores, restaurants and clubs. Fireworks launched from Taipei 101 feature prominently in international New Year's Eve broadcasts, and the landmark appears frequently in films, television shows, print publications, anime media, games, and other elements of popular culture.

The name of the tower reflects its location in Taipei's 101 business district and its floor count. (See also "Symbolism" below.) The number is pronounced in English simply as One Oh One and in Mandarin by the equivalent.

Taipei 101 is owned by the Taipei Financial Center Corporation and managed by the International division of Urban Retail Properties Corporation based in Chicago USA. The name originally planned for the building, Taipei World Financial Center, was derived from the name of the owner. The original name in Chinese was literally, Taipei International Financial Center ( ).

Taipei 101 was overtaken in height on July 21 2007 by the Burj Dubai in Dubai, UAE, upon the completion of that building's 141st floor. The title of "world's tallest building" still rests with Taipei 101, though, as international architectural standards define a "building" as a structure capable of being fully occupied. The Burj Dubai is on course to claim the title once its construction is finished.