Biertan (German: Birthälm, Romani: Biyertan, Hungarian: Berethalom) is a commune in central Romania, in the north of the Sibiu County, 80 km north of Sibiu and 29 km east of Mediaș. Biertan is one of the most important Saxon villages with fortified churches in Transylvania, having been on the list of UNESCO World Heritage Sites since 1993. The Biertan fortified church was the see of the Lutheran Evangelical Bishop in Transylvania between 1572 and 1867.

The commune is composed of three villages: Biertan, Copșa Mare (Gross-Kopisch; Nagykapus) and Richiș (Reichesdorf; Riomfalva), each of which has a fortified church.