AIMS: To discover nurse managersʼ perception of negative workplace behaviours (bullying) encountered by staff on their unit. BACKGROUND: Negative workplace behaviour is a worldwide phenomenon happening in all types of work settings. Absent from the literature were studies specific to the nurse managersʼ perception on this topic. METHODS: A phenomenological qualitative research methodology was used to gain insight into the perceptions of nurse managers about negative workplace behaviours that they have observed or addressed. RESULTS: Nurse Managers described their perceptions of, and experiences pertaining to, instances of negative workplace behaviour. Six themes emerged from the data analysis: ‘thatʼs just how she is’, ‘they just take it’, ‘a lot of things going on’, ‘old baggage’, ‘three sides to a story’ and ‘a management perspective’. CONCLUSION: Nurse Managers had observed, experienced and/or had received reports of negative workplace behaviours. While some felt comfortable addressing the behaviour, others experienced ethical dilemmas when trying to treat all fairly. IMPLICATIONS: The results of the present study provide guidance for nurse managers to address negative workplace behaviours occurring on their units.