Sloviansk (Ukrainian: Слов'янськ, translit. Slov'ians'k; Russian: Славянск, tranlit. Slavyansk; also spelled Slovyansk and Slaviansk) is a city in eastern Ukraine, an administrative center of the Sloviansk Raion (district) within the Donetsk Oblast. It was founded in 1676, and has a population of 129,600.

In 1676 a fortress named Tor was built at the confluence of the Kazenyy Torets and Sukhyy Torets rivers where they form the Torets river, a tributary of Donets river. Shortly thereafter the town of Tor grew up next to the fortress.

As several salt lakes were located close by, the town became a producer of salt. During the sixteenth century, salt production was the principal local industry, but during the eighteenth century it became unprofitable and ceased on December 21, 1782.

In 1784 the city was renamed Sloviansk.

Currently the city is an important health resort.

The principal industry of the city concerns machine building:

Religious organisations • Christian churches: