Wainer is a surname. Notable people with the surname include:
Alejandro Rojas Wainer (1945–2018), Chilean-Canadian academic Bertram Wainer (1928–1987), Australian physician Cherry Wainer (1935–2014), South African musician Howard Wainer (born 1943), American statistician and writer Samuel Wainer (1910–1980), Brazilian journalist and writer Zoe Wainer, Australian doctor and public health executive, head of the Australian Centre for Disease Control
See also Rachel Wainer Apter (born 1980/1981), New Jersey lawyer Wainer Lusoli (born 1974), Italian academic