Wong Tai Sin District is one of the 18 districts of Hong Kong. It is the only landlocked district in Hong Kong. It is located in Kowloon, and is the northernmost district in Kowloon. It borders the districts of Kwun Tong to its southeast, Kowloon City to its southwest, Sai Kung to its east, and Sha Tin to its north.

Kowloon is an urban area in Hong Kong comprising the Kowloon Peninsula and New Kowloon. It has a population of 2,019,533 and a population density of 43,033/km2 (111,450/sq mi) in 2006. It is one of the three regions of Hong Kong, along with Hong Kong Island and the New Territories, and is the smallest and most densely populated.