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