Horadam is a surname. Notable people with this name include:
- David Horadam (1883–1915), Australian rugby player
- Eleanor Mollie Horadam (1921–2002), English-Australian mathematician, mother of Kathy
- Ernst Horadam [de] (1883–1956), leader of the Freikorps Oberland and later German Nazi officer
- Kathy Horadam (born 1951), Australian mathematician, daughter of Eleanor Mollie
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