Interval may refer to:

• Interval (mathematics), a range of numbers (formally, a subset of an ordered set)
• Interval measurements or interval variables in statistics is a level of measurement
• Interval (music), the relationship between two notes
• Interval (time), the duration between two events
• Space-time interval, the distance between two points in 4-space
• Playing time (cricket)
• A synonym (especially UK usage) for an intermission in theatre
• Interval training, in sports, is a training technique often used by runners
• Interval Research Corporation, a defunct technology think tank founded by Paul Allen.

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