Ocna Sibiului (German: Salzburg; Hungarian: Vízakna) is a town in the centre of Sibiu County, in southern Transylvania, central Romania, 10 km (6.2 mi) to the north-west of the county seat, Sibiu. The town administers a single village, Topârcea (Tschapertsch; Toporcsa).

At the 2011 census, the town had 3,372 inhabitants, of which 89.4% were Romanians and 9.7% Hungarians. At the 2021 census, Ocna Sibiului had a population of 3,434; of those, 77.34% were Romanians, 6.61% Hungarians, and 2.82% Roma.

• Júlia Bányai (1824 – 1883), freedom fighter in the Hungarian Revolution of 1848
• Nicolae Cristea (1834 – 1902), Orthodox priest, professor, journalist, and political activist
• Ierusalima Gligor (1929 – 2021), nun, stavrophore, and hegumen
• Emil Hossu (1941 – 2012), actor
• Lajos Takács [ro] (1908 – 1982), jurist and communist politician

• Castra of Ocna Sibiului
• Lacul Auster
• Ocna Sibiului mine

• 
  Fortified church
• 
  Bath pavilion
• 
  Trajan Square
• 
  Train station