Hau is a surname. It may be a variant spelling of the Chinese surname Hao 郝, the Cantonese spelling of the Chinese surname Hou 侯, or a Danish surname. Notable individuals with the surname Hau include:

Alyson Hau (born 1983), Hong Kong radio DJ
Brian Hau (born 1982), Hong Kong singer-songwriter and author
Carl Hau (1881–1926), German lawyer and murderer
Caroline Hau (born 1969), Chinese-Filipino author and academic
Hau Chi-keung (born 1956), Hong Kong businessman
Eduard Hau (1807–1888), German painter and graphic artist
Gretchen Hau, Puerto Rican politician and lawyer
Johannes Hau (1771–1838), German painter
Lene Hau (born 1959), Danish physicist
Hau Lung-pin (born 1952), Taiwanese politician, Mayor of Taipei
Hau Man-kin (born 1992), Hong Kong activist and politician
Hau Pei-tsun (1919–2020), Chinese politician and military officer, Premier of the Republic of China
Hau Shui-pui (born 1924), Hong Kong politician
Hau Yung Sang (born 1917), Chinese-Taiwanese footballer
Woldemar Hau (1816–1895), German painter

See also 
Hau Latukefu (born 1976), Australian musician and radio host known as Hau
Tuku Hau Tapuha (born 2001), New Zealand rugby league footballer
Matt Te Hau (1912–1978), New Zealand Māori community leader
Hao (surname)
Hou (surname)

Hau