Sayan may refer to:
- Sayan (Mossad), a volunteer or unofficial Jewish foreign operative of the Mossad.
- Sayan Mountains, a mountain range in Siberia, Asia
- Sayan, India
- Sayan, Bali, a village in Indonesia
- Sayan, Iran, a village in Hamadan Province, Iran
- Sayán District, Peru
- Sayán, city in Peru
- Sayana, 14th century Indian commentator on the Vedas
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