Prejmer (German: Tartlau; Hungarian: Prázsmár) is a commune in Brașov County, Transylvania, Romania.

It is composed of three villages: Lunca Câlnicului (Farkasvágó), Prejmer, and Stupinii Prejmerului (Rohrau; Méheskert).

Located 18 km (11 mi) northeast of Brașov, the Olt River passes through the commune.

The town of Prejmer near the castle had begun development by 1225, and was the easternmost settlement of the Transylvanian Saxons.

Prejmer was repeatedly invaded throughout the Middle Ages by various groups, including the Mongols, Tatars, Hungarians, Ottoman Turks, Cossacks, and Moldavians.