'''Sieff''' is a surname. Notable people with the surname include:
*Adam Sieff (born 1954), Communications Director at Dune Music, and a former Sony Music Director of Jazz *Annika Sieff (born 2003), Italian ski jumper *Israel Sieff, Baron Sieff (1889–1972), British businessman *Jeanloup Sieff (1933–2000), fashion photographer *Joseph Sieff (1906–1982), businessman and British Zionist *Marcus Sieff, Baron Sieff of Brimpton OBE (1913–2001), Jewish British businessman, chairman of Marks & Spencer from 1972 to 1982
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