The period following Poland’s accession to the European Union saw significant changes in the migration patterns of the country’s population. There was an unprecedented increase in scale: in just three years the number of Polish citizens staying temporarily abroad rose from 1 million to over 2.3 million, or 6.6% of the total population. Migration dynamics changed as well, including choice of destination and migrants’ skills. Theoretically, such a massive supply shock should lead to severe adjustments on the sending labour market. Available empirical evidence, however, indicates that there were no significant effects in either the short term (employment/unemployment) or the medium term (wages). This chapter argues that the labour market situation in Poland was only moderately affected by the recent outflow. Nevertheless, serious long-term impacts may be in store, particularly in terms of demographic structures and regional allocation of labour on the domestic market.