Suplacu de Barcău (Hungarian: Berettyószéplak, Slovak: Siplak) is a commune in Bihor County, Crișana, Romania with a population of 3,813 as of 2021.

It is composed of six villages: Borumlaca (Baromlak), Dolea (Dólyapuszta), Foglaș (Fogás; Fogaš), Suplacu de Barcău, Valea Cerului (Cserpatak), and Vâlcelele (Blágarét).

The two oldest villages in the commune, Suplacu de Barcău and Borumlaca, were partly depopulated between 1686 and 1692, as a result of the Great Turkish War; the previous inhabitants began to return once hostilities ceased.

[2] Numerous families of Slovak colonists arrived in the late 18th century, leading to the appearance of two other villages, Vâlcelele and Valea Cerului.

This Bihor County location article is a stub.