Mykolaivka (, ) is a rural settlement in Sievierodonetsk Raion (district) in Luhansk Oblast of eastern Ukraine.
Mykolaivka located at about WNW from the centre of Luhansk city, at about SW from Sievierodonetsk.
As of 2001 it had a population of 403 people. Native language as of the Ukrainian Census of 2001:
The settlement came under attack by Russian forces during the Russian invasion of Ukraine in 2022. On 5 June of that year, the Russian general Roman Kutuzov was killed in Mykolaivka by Ukrainian forces.