Red belt may refer to:
- Red Belt (Pennsylvania), Allegheny County road belt system
- Red Belt (Pittsburgh), Allegheny County road belt system
- Red belt (martial arts)
- Red-Belted Clearwing, the European name of Synanthedon myopaeformis
- Redbelt, 2008 American film
Left-leaning areas
- Red Belt (Russia), area dominated by the Communist Party of the Russian Federation
- Red belt (Italy), area dominated by the PSI, PCI, PDS and PD
- Red belt (Community of Madrid)
- Red belt (India), the area where Maoist insurgency operates
- Red belt (France), area around Paris dominated by the PCF
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