Family participation in essential care may benefit patients and relatives. To examine the needs, perceptions and preferences of health care providers about family participation in essential care in the adult intensive care unit. A qualitative descriptive study using inductive thematic analysis. Three focus group interviews with a total of 30 intensive care unit health care providers, consisting of 20 critical care nurses, one nursing assistant, five physicians, three physical therapists and one speech therapist working in three Dutch intensive care units. One overarching theme, balancing interests, and four main themes emerged: looking after the patient's interests, taking the relatives' perspective into account, looking after interests of intensive care unit health care providers and conditions for family participation. The first theme, looking after the patient's interests, included three sub-themes: insecurity about patient's wishes and needs, patient safety concerns and potential benefits for the patient. The second theme, taking the relatives' perspective into account, was also characterized by three sub-themes: concerns about the relatives' possible burden, potential benefits for the relative and the relationship between patient and relative. The third theme, looking after interests of intensive care unit health care providers, included three sub-themes: attitude towards family participation in essential care, differing perceptions of essential care and concerns about intensive care unit health care provider's burden. The last theme, conditions for family participation, included two sub-themes: establishing a relationship and considering family participation in essential care as a process. Health care providers' perceptions and preferences regarding family participation in essential care in the intensive care unit are summarized in the overarching theme balancing interests. This overarching theme also reflects the needs and perceptions of patients and relatives. These findings may support critical care nurses and other health care providers when encouraging family participation in essential care.