Seljord is a municipality in Telemark county, Norway. It is part of the traditional region of Vest-Telemark. The administrative centre of the municipality is the village of Seljord. The parish of Siljord was established as a municipality on 1 January 1838 (see formannskapsdistrikt). Seljord is famous for its sea serpent, Selma, who allegedly lives in Lake Seljord.