**Deviation** may refer to:

- Deviation (statistics), the difference between the value of an observation and the mean of the population in mathematics and statistics
- Standard deviation, which is based on the square of the difference
- Absolute deviation, where the absolute value of the difference is used

- Frequency deviation, the maximum allowed "distance" in FM radio from the nominal frequency a station broadcasts at
- Magnetic deviation, the error induced in compasses by local magnetic fields
- Deviation (law) is a departure from a contract or a ship's course, thus breaching the contract
- Deviationism, an expressed belief which is not in accordance with official party doctrine
- Deviation Records, a record label
- Deviant behavior, a behavior that is a recognized violation of social norms
*Deviation*(Jayne County album), 1995*Deviation*(Béla Fleck album), 1984*Deviate*(Kill II This album), 1998- Deviation (film), a 2006 short film

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