Rubizhne (Ukrainian: Рубіжне, IPA: [rʊˈbiʒne] ^ⓘ; Russian: Рубежное, romanized: Rubezhnoye, IPA: [rʊˈbʲeʐnəjə]) is a city in Luhansk Oblast, in the Donbas region of eastern Ukraine. Situated on the left bank of the Donets River near the cities of Sievierodonetsk and Lysychansk. Prior to 2020, it was a city of oblast significance, before the designation was abolished.

In 2014, at the start of the war in Donbas, Rubizhne was contested between Ukrainian and pro-Russian separatist forces. From mid-2014 until early 2022, the city was under control of Ukrainian forces. From early 2022 it has been under Russian control following their victory in the Battle of Rubizhne. Russia claimed Rubizhne as part of their Luhansk People's Republic since its annexation of the region in September 2022.

The city had an estimated population of 56,247, as of January 2022, its current population is unknown.^{[citation needed]}

Rubizhne was founded in 1895 and incorporated as a city in 1934. The city started growing from a railway station built in 1904. A local newspaper is published in the city since March 1931.

During World War II, in 1942–1943, the German occupiers operated a Nazi prison in the town.

At the outbreak of the war in Donbas in mid-April 2014, pro-Russian forces captured several towns in Luhansk Oblast, including Rubizhne. On 21 July 2014, Ukrainian forces secured the city from the militants.

During the 2022 Russian invasion of Ukraine, within the Eastern Ukraine offensive, Rubizhne came under heavy shelling from the Russian military. Some of the most intense strikes occurred late in March 2022, which destroyed dozens of buildings and caused civilian casualties. An attack on a nitric acid facility in Rubizhne was reported on 9 April 2022.

During the battle of Donbas, on 21 April, Russia reportedly captured the city, although Ukraine denied that. Ramzan Kadyrov, the president of Chechnya, then stated that Russia had "liberated" the city on 25 April.