The Crișul Negru (Black Criș) (Romanian), (Hungarian: Fekete-Körös) is a river in western Romania (Transylvania) and south-eastern Hungary (Békés County).

The river has its source in the western Apuseni Mountains of Romania.

Flowing through the Romanian towns of Ștei and Beiuș and crossing the border of Hungary, the river, now called Fekete-Körös, joins the Fehér-Körös a few kilometres north from Gyula to form the Körös river.

The name of this river comes from earlier Dacian Krísos, which meant "black",[3] making this a doublet (cf.

The following towns and villages are situated along the Crișul Negru, from source to mouth: Vașcău, Ștei, Rieni, Drăgănești, Tărcaia, Beiuș, Șuncuiuș, Uileacu de Beiuș, Șoimi, Căpâlna, Tinca, Batăr, Avram Iancu, Zerind in Romania, and Sarkad in Hungary.