This paper presents the main findings from Part I of a study investigating if workplace coaching can reduce stress. Thirty-one participants from a UK finance organisation took part in the quasi-experimental study. Depression, anxiety and stress were measured before and after coaching in a coaching and control group. Levels of anxiety and stress had decreased more in the coaching group compared to the control group, and were lower in the coaching group compared to the control group at the end of the study. However, levels of depression had decreased more in the control group compared to the coaching group. Mixed ANOVAS found no significant interactions between time and coaching for depression, anxiety or stress. Nevertheless, high levels of perceived coaching effectiveness were reported by the participants.