The Pirai River may refer to:
- the Piray River in Bolivia
- the Piraí River (Paraná), a river of Paraná state in southern Brazil
- the Piraí River (Rio de Janeiro), a river of Rio de Janeiro state in southeastern Brazil
- the Piraí River (Santa Catarina), a river of Santa Catarina state in southeastern Brazil
- the Pirai River (India), a river of India
This disambiguation page lists articles associated with the title Pirai River.
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