This article examines the relationship between work-related stressors and bullying and harassment in British small and medium sized enterprises (SMEs). Using representative data from a national survey on employment rights and experiences (Fair Treatment at Work), this research identifies that bullying and harassment are just as prevalent in British SMEs as in larger organisations. Drawing upon the Management Standards of the Health and Safety Executive, a number of significant relationships with bullying and harassment are established. Work demands placed upon employees are positively related to bullying and harassment behaviours, while autonomy, manager support, peer support and clarity of role are negatively associated with such behaviours. The study considers implications for human resource practices in SMEs, and the risks of informal attitudes to these work-related stressors in contemporary workplaces are discussed.