Pervomaysk, or Pervomaisk, is a popular toponym in countries of the former Soviet Union that is derived from the holiday May Day (, Pervoye Maya), the International Workers' Day.
Pervomaysk or Pervomaisk may refer to:
Pervomaysk, Russia, multiple places in Russia Pervomaisk, Ukraine, multiple places in Ukraine
See also Pervomaisc (disambiguation), toponyms in Moldova Pervoye Maya (disambiguation) Pervomaysky (disambiguation) Pervomaiske (disambiguation) Pervomaiske Raion, a district in Crimea, Ukraine