This paper explores clinical nurse supervisors' ethical styles with regard to supervision in healthcare. Eighty-six registered nurses, all with experience of supervising clinical nurses and students in nursing, completed a specifically designed questionnaire. A qualitative interpretative content analysis identified three core themes: (i) 'Is it safe?'; (ii) 'Is it right?'; and (iii) 'Is it kind?', describing the clinical nurse supervisors' ethical styles. The first core theme 'Is it safe?' covered the supervisors' rules, codes and values that guide their supervisory actions, as well as two sub-themes: (i) empowerment and (ii) integrity. The second core theme 'Is it right?' described the supervisors' responsibility and advocacy as well as the ethical dilemmas experienced in the supervisory process. The third core theme 'Is it kind?' included the supervisors' relationships with patients, professionals and supervisees. The results demonstrate the value of offering a support system, such as clinical supervision, which helps nurses to explore their professional identity for the benefit of the patients.