Monotone refers to a sound, for example speech or music, that has a single unvaried tone.

Monotone or monotonicity may also refer to:

• Monotone (common), repetitive and tedious activities
• Monotone (software), an open source revision control system
• Monotone class theorem, in measure theory
• Monotone convergence theorem, in mathematics
• Monotone polygon, in computational geometry
• Monotone preferences, in consumer economics
• Monotonicity criterion, a voting system criterion
• Monotonic function, mathematical concept
• Monotonic orthography, simplified spelling of modern Greek
• Monotonicity of entailment, property of some logical systems
• The Monotones, American rock 'n' roll band (1950s)

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