The Chang-Gu World Trade Center (Chinese: 長谷世貿聯合國大樓; pinyin: Chánggǔ Shìmào Liánhéguó Dàlóu), also known as Grand 50 Tower, is a 222 metres (728 ft) tall skyscraper in Sanmin District of Kaohsiung, Taiwan.

After its completion in 1992, the Chang-Gu World Trade Center became the tallest building in Taiwan surpassing the 169.8 meters high Asia-Pacific Financial Plaza in Kaohsiung.

It kept the title as the tallest building in Kaohsiung for 5 years until the completion of the Tuntex Sky Tower in 1997.

The building follows a Chinese pagoda style and has an octagonal base to be stable against high winds which are typical in Taiwan as it is prone to typhoons.

The top is home to the Grand 50 Club which is managed by the Peninsula Group based in Hong Kong.