BackgroundNew intensive care unit (ICU) nurses often experience stress because of concerns about potentially harming their patients in a work environment that demands the rapid development of several skills in a limited training period.AimThis study aimed to investigate the prioritisation of educational needs within adult ICUs, focusing on how new nurses evaluate their current knowledge and perceive the most critical competencies.Study DesignA cross‐sectional study was conducted among a convenience sample of 102 new ICU nurses in general and tertiary hospitals in South Korea. Educational needs were assessed using a structured questionnaire for new ICU nurses. This study investigated educational needs using paired t‐tests, Borich's assessment model and the Locus for Focus model.ResultsOnly 48% of participants were satisfied with their education. The highest‐rated educational content included preparing to use a defibrillator (95% CI = 2.44–3.28, p < .001), administering emergency drugs for cardiopulmonary resuscitation (CPR) (95% CI = 2.09–2.91, p < .001), starting and maintaining continuous renal replacement therapy (95% CI = 1.50–2.42, p < .001), applying and maintaining a ventilator (95% CI = 1.42–2.08, p < .001), preparing for intubation (95% CI = 1.23–1.97, p < .001), reporting to the emergency team, preparing equipment for CPR (95% CI = 1.12–1.94, p < .001) and drug calculation (95% CI = 0.87–1.53, p < .001).ConclusionsThese findings indicate that educational programmes for new ICU nurses should be developed considering the aforementioned priorities. Furthermore, nurse educators should adopt a practical and active instructional method to repeatedly clarify content, prioritising the improvement of knowledge and performance of new ICU nurses.Relevance to Clinical PracticeThis study guides clinical educators and managers in focusing on areas where new ICU nurses need additional training. Effective nurse residency programmes tailored to the specific needs of new ICU nurses can enhance their confidence and ability to handle ICU nursing challenges.