Wu Sang House, Commercial building in Kowloon, Hong Kong, China.

Wu Sang House, now also called 655 Nathan Road, is a 26-storey commercial tower at 655 Nathan Road in Mong Kok, directly above Mong Kok MTR station and beside the HSBC Mong Kok building. It has two main entrances: one serving the low-level restaurants near Exit E1, another for upper-floor offices near the HSBC building. Its top floor keeps the round, disc-shaped form of the former revolving restaurant.

Wu Sang House was completed in 1966, when its 26 storeys made it the tallest building in Mong Kok. It was developed by Wu Chung, father of Hopewell Holdings founder Gordon Wu, and named after his own father, Wu Sang. Hopewell acquired the building in 1973.

The name Sin Hau, given to the 26th-floor restaurant, referred to the Queen of Heaven, and the opening in 1966 was marked by a ribbon-cutting by Shaw Brothers star Ho Li-li. Western food was served until the 1980s, when the venue became a Cantonese restaurant; it closed in 1996. In 2018 singer Hins Cheung recreated Sin Hau Restaurant in Wan Chai.

The building sits in central Kowloon and remains actively used for commerce on each floor. The exterior is freely visible from the street, though interior access depends on individual businesses housed within.

The top floor kept its round, dish-like outline after the revolving platform stopped turning in 1996, so the circular shape visible from Nathan Road is the last trace of Sin Hau Restaurant. The restaurant's opening was attended by Shaw Brothers star Ho Lai-lai, who cut the ribbon.