Taipei 101 (pictured) in Taipei, Taiwan, opened to the public as the world's tallest building.

The Taipei 101, formerly known as the Taipei World Financial Center, is a 508 m, 101-story skyscraper in Taipei, Taiwan. It is owned by Taipei Financial Center Corporation. It was officially classified as the world's tallest building from its opening on 31 December 2004, until it was dethroned by the Burj Khalifa. Upon completion, it became the world's first skyscraper to exceed half a kilometer. It is the tallest building in Taiwan and the eleventh tallest building in the world.

Taipei, officially Taipei City, is the capital and a special municipality of Taiwan. Located in Northern Taiwan, Taipei City is an enclave of the municipality of New Taipei City that sits about 25 km (16 mi) southwest of the northern port city of Keelung. Most of the city rests on the Taipei Basin, an ancient lakebed. The basin is bounded by the relatively narrow valleys of the Keelung and Xindian rivers, which join to form the Tamsui River along the city's western border.

This is a list of the tallest buildings. Tall buildings, such as skyscrapers, are intended here as enclosed structures with continuously occupiable floors and a height of at least 350 metres (1,150 ft). Such definition excludes non-building structures, such as towers.