Drobeta-Turnu Severin, coloquially Severin, is a city in Mehedinti County, Oltenia, Romania, on the northern bank of the Danube, close to the Iron Gates.

The city administers three villages: Dudasu Schelei, Gura Vaii, and Schela Cladovei. The city's population is of 92,617 (2011), up from 18,628 in 1900.

The city's name was originally linked by historians with the Roman Emperor Septimius Severus, during whose reign the name of the city was Drobeta Septimia Severiana. However, the name may be derived from Old Church Slavonic severno ("northern"). The name of Turnu ("Tower") refers to a tower on the north bank of the Danube built by the Byzantines. Thus, the name of the city would mean "Northern Tower".

Another possibility is that Severin's name was taken in memory of Severinus of Noricum, who was the patron saint of the medieval colony Turnu, initially a suffragane of the Diocese of Kalocsa.

It is situated in western Oltenia, at the edge of the Topolnita depression, 220 km south-east of Timisoara, 113 km west of Craiova and 353 km west of Bucharest.

The region's climate gives Severin warm summers and mild winters, meaning the city is home to magnolia trees, Caucasian nut trees, and ginkgo biloba as well as the almond trees, figs, lilacs, lindens, and chestnut trees more common throughout Europe. The climate in the region can be classified as a "sub-Mediterranean climate".