Waldau is a surname. Notable people with the surname include:
*Åsa Waldau (born 1965), Swedish religious leader
*Harry Waldau (1876–1943), German musician
*Max Waldau (1825–1855), German poet and writer
*Nikolaj Coster-Waldau (born 1970), Danish actor
*Nukâka Coster-Waldau (born 1971), Greenlandic singer and actress
*Paul Waldau, American academic
{{surname, Waldau