Syðradalur is the southernmost village on the island, and is in Húsar Municipality.

[2] Syðradalur was previously inhabited in the 17th century, but the reason it was abandoned is unknown.

A tunnel system was built in 1985 linking Syðradalur with the other villages on the island.

MF Sam travels the route between Syðradalur and Klaksvík 6–9 times a day, and later a bus service from Syðradalur to Trøllanes, with stops at every village between, 2–4 times daily.

In 2009, house numbers were introduced to the village, together with the three street names Dalsgøta, á Bakkanum and Knúksdalur.