This study aimed to assess the level of nurses' knowledge about bariatric surgery and to find the relationship between Nurses' knowledge about bariatric surgery and their demographic characteristics (age, gender, level of education, and years of experience). A descriptive-analytic study was conducted on nurses' knowledge toward bariatric surgery at surgical wards at Al-Sader Teaching Hospital, Al-Faiha Teaching Hospital, and Al-Mawani Teaching Hospital in Al-Basra City. The period of the study was extended from the 15 th of November 2020 to the fifth of April 2021. Purposive (non-probability) sample covers (100) nurses who work in the surgical wards, a questionnaire was designed to investigate nurses' demographics, knowledge toward obesity, bariatric surgery, complications of bariatric surgery, and postoperative nursing care and patient education. The results of this study showed that 85% of studied nurses had poor knowledge about bariatric surgery, 14% of nurses had moderate knowledge and only 1% of nurses had good knowledge.