Cernavodă (Romanian pronunciation: [t͡ʃernaˈvodə], historical names: Thracian: Axiopa, Greek: Axiopolis, Bulgarian: Черна вода Cherna voda, Turkish: Boğazköy) is a town in Constanţa County, Dobrogea, Romania with a population of 20,514.

The town's name is derived from the Slavic (more precisely Bulgarian) černa voda (черна вода in Cyrillic), meaning "black water". This name is regarded by some scholars as a calque of the earlier Thracian name Axíopa, from IE *n.ksei "dark" and upā "water" (cf. Avestan axšaēna "dark" and Lithuanian ùpė "river, creek").

The town is a Danube fluvial port, and it houses the Cernavodă Nuclear Power Plant, consisting of two CANDU reactors providing about 18% of Romania's electrical energy output. The second reactor was built through a joint venture between Canada's Atomic Energy of Canada Limited and Italy's ANSALDO and become fully functional in November 2007.

The Danube-Black Sea Canal, opened in 1984, runs from Cernavodă to Agigea and Năvodari.

The outskirts of Cernavodă host numerous vineyards, producers of Chardonnay wine. The largest winery in the area is Murfatlar.

Anghel Saligny (Romanian pronunciation: [ˈaŋɡel saˈliɲi]; 19 April 1854 – 17 June 1925) was a Romanian engineer, most famous for designing the Feteşti-Cernavodă railway bridge (1895) over the Danube, the longest bridge in Europe at that time. He also designed the storage facilities in Constanţa seaport, one of the earliest examples of reinforced concrete architecture in Europe.

Saligny was born in Focşani in the eastern province of Moldavia. His father Alfred Saligny, an educator, was a French immigrant to Romania, coming from the region of Alsace. He started his studies at the boarding school founded by his father in Focşani, then went on to high school, initially also in Focşani and then in Potsdam, Germany. He pursued engineering studies at the Polytechnical Institute in Charlottenburg, and then contributed to the construction of railways in Saxony (Cottbus-Frankfurt an der Oder). He was a founding member of the Bucharest Polytechnic Society (the precursor to today's Bucharest Polytechnic Institute) and was even appointed a Minister of Public Works. In 1892, he was elected a member of the Romanian Academy, and he served as its president between 1907 and 1910.