The competences of intensive care (ICU) nurses in their healthcare environment, have increased with the acquisition of new responsibilities associated with new care and devices for critical patients. Many studies suggest the need for specific training of nurses that work in these units. Based on this evidence, the European Federation of Critical Care Nurses Associations, recommends unifying the training of intensive care nurses. Therefore we set ourselves the following objective: to assess the training needs detected by ICU nurses through their experience and practical knowledge.Descriptive qualitative study, with a phenomenological approach, through semi-structured interview where the four areas (clinical practice, professional, management and educational) covered by the European Federation of Critical Care Nurses Associations were studied. Fifteen nurses from an adult polyvalent ICU were interviewed.The interviewees acknowledged that the previous training was deficient for the care and support measures that they had to face. They considered that subsequent training and experience were decisive in order to carry out their work effectively. They also stated that support measures and care are topics to be developed continuously through targeted training.The nurses in this research study acknowledged that training is needed to achieve the competences required in ICU, and these are affected by the type of unit and patients.