Fluxion may refer to:
- An alternate spelling of fluxon, a quantum of magnetic flux, such as in a superconductor
- Fluxion was Isaac Newton's term for the derivative of a "fluent", or continuous function.
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- Method of Fluxions, Isaac Newton's terminology for differential calculus
- Newton's notation for differentiation
- Newton's method for solving an equation
- Derivative
- Fluxion (artist), Konstantinos Soublis
- Fluxion (album), The Ocean Collective's first LP.