| Official Name: | Slovianoserbsk |
| Native Name: | Слов'яносербськ |
| Settlement Type: | Rural settlement |
| Subdivision Type: | Country |
| Subdivision Type1: | Oblast |
| Subdivision Type2: | Raion |
| Subdivision Name2: | Alchevsk Raion |
| Subdivision Type3: | Hromada |
| Subdivision Name3: | Zymohiria urban hromada |
| Established Title: | Founded |
| Established Date: | 1753 |
| Established Title1: | City Status |
| Leader Title: | Mayor |
| Population As Of: | 2022 |
| Population Total: | 7659 |
| Population Density Km2: | auto |
| Pushpin Map: | Ukraine Luhansk Oblast#Ukraine |
| Pushpin Label Position: | Slovianoserbsk |
| Coordinates: | 48.6964°N 38.9817°W |
| Postal Code Type: | Postal code |
| Area Code: | (+380) |
| Registration Plate: | BB / 13 |
| Blank Name: | Climate |
| Blank Info: | Dfb |
Slovianoserbsk (Ukrainian: Слов'яносербськ|Slovyanoserbsk; or Slavianoserbsk, Russian: Славяносербск|Slavyanoserbsk) is a rural settlement in Zymohiria urban hromada, Alchevsk Raion (district), Luhansk Oblast (region), Ukraine, on the Donets river.[1] Its population is,
The settlement was founded by Orthodox Christian settlers from the Balkans as part of the Slavo-Serbia colony in 1753.[1] It was originally a military settlement known as Pidhirne (Ukrainian: Підгірне; Russian: Подгорное|Podgornoye), its purpose to protect the southern frontier of the Russian Empire from Tatars. It was granted town status in 1784 and renamed to Donetske (Ukrainian: Донецьке|link=no; Russian: Донецкое|Donetskoye|link=no).[1] It was the county seat of Donets county from 1764 to 1796.In 1817, due to frequent floods, the town was moved, and renamed to Slovianoserbsk.[1] Also in 1817 it became again a county seat, and both the town and county were renamed to Slavianoserbsk. In 1870, the town had a population of 3,156. It hosted three annual fairs in the late 19th century.[2]
A local newspaper has been published in the city since March 1939.[3] During World War II, in 1942–1943, the German occupiers operated a prison in the town.[4] In 1964, Slovianoserbsk received urban-type settlement designation, and in 1966 it became the center of Slovianoserbsk Raion.[1]
Since 2014, Slovianoserbsk has been controlled by the separatist troops of the Luhansk People's Republic and their Russian supporters.[5] In 2020, the Ukrainian government abolished Slovianoserbsk Raion, and now considers the town to be part of Alchevsk Raion. However, the internationally unrecognised Luhansk People's Republic continues to use the pre-2020 administrative divisions of Ukraine.
According to the 2001 census in Ukraine, the town had 61.72% Russian speakers and 37.54% Ukrainian speakers.