Tsing Yi Lagoon (Chinese: 青衣塘), or Tsing Yi Tong, was a lagoon in east shore of Tsing Yi Island in Hong Kong. Its water came from a stream of the nearby valley Liu To and its outlet was Tsing Yi Bay. It acted as the shelter for nearby boat people, especially after large-scale reclamation in Tsuen Wan and Kwai Chung. Once their boats moved in the lagoon, they never moved out. This was because their boats were too old for fishing far away. The lagoon was unable to escape the fate of development. Both the lagoon and its neighbour water, Tsing Yi Bay, were reclaimed for new town. The boat people were forced to give up their boats and were relocated to public housing estate on the island. After reclamation, the northern portion became Tsing Yi Estate and the remainder became temporary housing areas, which were demolished later.