Hang Hau (Chinese: 坑口) is a residential area in Tseung Kwan O, Sai Kung, New Territories, Hong Kong.

Hang Hau got its name from a large water channel near Mang Kung Uk (孟公屋) that led to the sea.

Nowadays, Hang Hau is fully built-out with private and public estates owing to the development of Tseung Kwan O New Town.

Public transport in Hang Hau is served by the MTRC, Kowloon Motor Bus (KMB), and also Citybus.

Hang Hau Station, located near Residence Oasis and a major bus terminus, also provides Tseung Kwan O Line train services.