Sayer is a surname, and may refer to:
Andrew Sayer (born 1949), British social scientist and philosopher of science
George Sayer (1914–2005), English teacher and biographer
George Sayer (MP) (1655–1718), English politician, MP for Canterbury
Gerry Sayer (1905–1942), British pilot and air force officer
Guillaume Sayer (c.1801–c.1849), Métis fur trader
Ian Sayer (1945–present), English writer and businessman
John William Sayer (1879–1918), English non-commissioned officer in World War I and Victoria Cross recipient
Leo Sayer (1948–present), British singer-songwriter
Malcolm Sayer (1916–1970), British aircraft and car designer
Paul Sayer (born 1955), English novelist
Peter Sayer (born 1955), Welsh professional footballer
Phil Sayer (1953-2016), British voice artist
Richard Sayer, English politician, MP for Grampound
Sylvia Sayer (1904–2000), English conservator
William Sayer (1857–1943), Australian lawyer and politician
