Siljan may refer to:
People
- Siljan Avramovski, a Macedonian police official and former Minister of Internal Affairs
Places
Norway
- Siljan, Norway, a municipality in Telemark county, Norway
- Siljan (village), a village in Siljan Municipality in Telemark county, Norway
- Siljan Church, a church in Siljan Municipality in Telemark county, Norway
Sweden
- Siljan (lake), a lake in Dalarna, Sweden
- Siljan Ring, a prehistoric impact crater in Dalarna, central Sweden