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Look up sij in Wiktionary, the free dictionary.
Sij or SIJ may refer to:
- Sacroiliac joint
- Special Immigrant Juvenile Status
- Siglufjordur Airport, IATA code
- Sij, Gilan, a village in Iran
- Sij, Razavi Khorasan, a village in Iran
- Sij, South Khorasan, a village in Iran