Foucault may refer to:
- Foucault (surname)
- Léon Foucault (1819–1868), French physicist. Three notable objects were named after him:
- Foucault (crater), a small lunar impact crater
- 5668 Foucault, an asteroid
- Foucault pendulum
- Michel Foucault (1926–1984), French philosopher
- Foucault (Deleuze book) (1986), a book about the French philosopher by Gilles Deleuze
- Foucault (Merquior book) (1985), a book about the French philosopher by J. G. Merquior
See also
- Foucault's Pendulum (1988), a novel by Umberto Eco
- Charles de Foucauld, explorer of Morocco, Catholic religious and priest
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