This research aimed to explore the experience of emotional burden among peer support workers (PSWs) in mental health care in Poland. It also examined the issue of moral distress in relation to this professional group and identified institutional sources of support for the well-being of PSWs in the workplace. The data presented in the article are derived from fourteen qualitative in-depth individual interviews with PSWs employed in four mental health centres with different organisational structures. The narratives of PSWs revealed several experiences that could be considered to be moral distress. The inability to assist patients was found to be associated with both individual and institutional barriers. Furthermore, our findings suggest that organisations can implement a number of specific practices to ensure the wellbeing of PSWs, which dissemination would be beneficial to teams employing PSWs.