Duby is a surname. It may refer to:
Caroline Duby Glassman (1922–2013), U.S. attorney and jurist Craig Duby (born 1949), Australian politician Dora Duby (1901–1998), American dancer Georges Duby (1919–1996), French historian Heather Duby (born 1974), U.S. singer/songwriter Jacques Duby (1922–2012), French actor Jean Étienne Duby (1798–1885), Swiss clergyman and botanist, Virginie Duby-Muller (born 1979), French politician