The earliest history referring to Hang Hau was in the 19th century. It was an agricultural and fishing village. Hang Hau got its name from a large water channel near Mang Kung Uk () that led to the sea. In days gone by, Hang Hau was on the sea front, facing
Junk Bay. Many of the village names in Hang Hau reflect this – Shui Bin Village () means
Waterside Village, for example. On 2 October 1957,
Hang Hau Rural Committee was established. The rural committee was to serve the
indigenous inhabitants in Hang Hau Village, Shui Bin Village, Tin Ha Wan Village, Yau Yue Wan Village,
Tseng Lan Shue,
Tai Po Tsai, Mang Kung Uk and
Po Toi O. Between the 1960s and 1980s, Hang Hau was a large ship scrapyard area. Since there was a ferry from Junk Bay to Island East Hong Kong,
Hong Kong Oxygen Company started building factories in Hang Hau. Manufacturing business and trading services were established. Long before the development of
Tseung Kwan O New Town, Hang Hau was near settlements such as Hang Hau Village, Boon Kin Village and Tin Ha Wan Village. Most of the Villages were relocated at the current site near the
Tseung Kwan O Hospital, which were moved after the new town's development. Now, about two-thirds of Hang Hau is on reclaimed land, and the sea is far away. ==Housing==