There are an increasing number of studies that have monitored the impact of Stress Management Interventions (SMls) and the results of these studies can play a vital role in informing the development of more effective, evidenced-based SMIs. In this paper, the authors have undertaken a review of United Kingdom (UK)-based research that has tested the impact of SMIs. Sixteen studies were examined and the results revealed that the vast majority of interventions were targeted at the individual employee, although there was a tendency for more recent research to focus on organisational level interventions. While all intervention levels were found to have some human and/or organisational benefits, strategies aimed at the individual level were less likely to result in longer-term benefits. An examination of the research methods used in the 16 studies indicated that UK-based researchers are beginning to adopt more rigorous research methods. However, there was a tendency for researchers to evaluate interventions over a relatively short time-frame. The implications of these findings for future research are discussed.