Deviation can 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.
• 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 (band), sometimes spelled DeVIAtion, a Belarusian punk rock bank.
• Deviation (album), a punk rock album by Jayne County.

Deviates is also the name of an American punk rock band.