Pervomaysky (masculine), Pervomayskaya (feminine), or Pervomayskoye (neuter) are Russian toponyms. The words are the adjectives derived from "Первое мая" "(1st of May"), the International Workers' Day. It may also refer to:
- Pervomaysky District, name of several districts and city districts in Russia
- Pervomaysky Okrug, name of various divisions in Russia
- Pervomaysky, Russia, name of several inhabited localities in Russia
- Pervomaiske Raion, a district of Crimea, Ukraine
- Pervomaiskyi, a town in Kharkiv Oblast, Ukraine
- Pervomayskiy, former name of Birinci Mayak, Azerbaijan
- Pervomayskiy, Kazakhstan, a village in the Almaty Province, Kazakhstan
- Pervomayskaya (Moscow Metro)
- Pervomayskaya (closed)
- Pervomayskoye, alternative name of Bir May, a village in Azerbaijan
- Pervomayskoye, Kazakhstan, a village in the Almaty Province, Kazakhstan
- Pervomayskoye, Panfilov, a village in the Panfilov District, Chuy Province, Kyrgyzstan
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