Hoiby or Høiby is a surname. Notable people with the surname include:
- Jasper Høiby (born 1977), Danish jazz musician
- Lee Hoiby (1926–2011), American composer and pianist
- Marius Borg Høiby
- Sven O. Høiby (1936–2007), father of Crown Princess Mette-Marit of Norway
- Trond Høiby (born 1973), Norwegian decathlete
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