The plastic deformation behaviour of binary Fe-Mn alloys with Mn content in the range 0.42-1.21% has been investigated in tensile tests performed at different temperatures and strain rates. The results show that the temperature and the strain rate introduce opposite effects on the stress-strain curves. On the other hand, the stress-strain response of the Fe-Mn binary alloys is sensitive to the Mn content. Obviously there is a linear increase of the yield stress with increasing Mn content due to solid solution hardening.