Sidey is an English surname. Notable people with this surname include:

Hugh Sidey (1927–2005), American journalist Jenni Sidey-Gibbons (born 1988), Canadian astronaut, engineer and academic Norman Sidey (1907–1969), English football player Rory Sidey (born 1986), Australian rugby union player Stuart Sidey (1908–2007), New Zealand politician Thomas Sidey (1863–1933), New Zealand politician

Also this name appears in Thranscarpathia region in Ukraine and Russia, each surname formed differently.

See also Sidey, Manokwari Regency, Indonesia