The aim of this study is to investigate the relationship between leaders' negative emotions and leadership styles. Faculty members at a Swedish university between 1995 and 2007 were surveyed. Members who had worked at the same institution the entire period provided a total of 48 assessments regarding the styles and emotions of their leaders (deans). The results show that some negative emotions and leadership styles are related. For an organisation to perform well (e.g., in terms of work environment), leaders should consider managing their emotions.