Krasnoarmeysk may refer to:
- Krasnoarmeysk, Moscow Oblast, a town in Russia, and its surrounding municipal division (urban okrug)
- Krasnoarmeysk, Saratov Oblast, a town in Russia, and its surrounding municipal division (urban okrug)
- Pokrovsk, Ukraine, formerly Krasnoarmiisk (Krasnoarmeysk), a town in Ukraine
- Taiynsha, Kazakhstan, formerly Krasnoarmeysk