The purpose of this study was to describe Finnish ICU nurses' (n=172) experiences of autonomy in their work. The research was carried out as part of a project concerned with empowerment in intensive care nursing. Viewed from a psychological perspective, empowerment is understood as referring to the ability to make goal-directed decisions and to take action towards meeting the goals set out. Autonomy, then, is seen as part of empowerment. The data were collected with a structured questionnaire specially designed for this study. The random sample was drawn from 31 Finnish adult intensive care units. The respondents were registered nurses working in eight adult intensive care units. The data were analysed using statistical methods. Autonomy was defined as being composed of three bases: knowledge base (independence, right and responsibility in decision-making), action base (independence, right and responsibility in actions) and value base (independence, right and responsibility in values). The majority of the respondents felt they had more autonomy in decision-making and actions concerning patient care than in decision-making and actions concerning the intensive care unit as a whole. Autonomy usually increased with work experience. Work will be continued to study the autonomy of nurses in different health care organisations in Finland.