Introduction: Hemodynamic monitoring is widely accepted as a cornerstone of intensive care units (ICUs). So, the main objective of this study was to evaluate the educational needs assessment of nurses for hemodynamic monitoring in ICUs. Methods: The present descriptive–analytical study was conducted to evaluate the educational needs assessment of ICU nurses in terms of the hemodynamic monitoring. The research sample included 100 ICU nurses selected from the hospitals affiliated to Shahid Beheshti University of Medical Sciences, Tehran. For data collection, researcher-made observational checklist and researcher-made questionnaire of clinical reasoning skills were used to assess the educational needs for hemodynamic monitoring. Results: The findings from the clinical practice checklists on hemodynamic monitoring revealed that nurses' practice was moderate in all 10 cases of monitoring with a mean of 79.30% (SD = 15.32%). Moreover, the nurses included were given a 9-item questionnaire regarding clinical reasoning skills. Accordingly, the results of this questionnaire indicated that nurses' clinical reasoning skills were at a poor level with a mean of 52.56% (SD = 8.71%). Discussion: The findings suggested that the development of continuing education programs in the area of clinical reasoning skills for hemodynamic monitoring should be more emphasized on. Also, nurses need to learn how to examine the patient carefully, find nursing diagnoses, set goals of care, and plan nursing interventions for their patients. They should also be able to assess how they affected the patient after performing the interventions. Furthermore, attention should be paid on improving practical skills for hemodynamic monitoring.