Background: Breast self-examination is easy, non-intrusive time- and money-consuming to perform, and it can be done by older as well as younger women. Cancer risk is increased for women who don't undertake BSE. Breast cancer comes in second as the most common illness in women. Objectives: to evaluate the nursing students' understanding of breast self-examination. Methodology: Between November 1st, 2021, and April 1st, 2022, a descriptive and probability study involving (120) female students at the university of Basrah's nursing college was performed. A questionnaire designed to achieve the study's objectives was used to gather data. It has two parts: the first asks about sociodemographic information, and the second gauges respondents' knowledge of breast self-examination and their awareness of the topic. To evaluate the data, descriptive and inferential statistics were employed. Results: Most of the investigation's samples are within the years of 21 and 24, and many of them are single, most are at stage 3, and the bulk don't have any ancestors who have had cancer, according to the study's findings, that the majority of them don't regularly self-examine their breasts, that they live in cities, and that books were their main source of data. Conclusion: Breast self-examination was not well understood by the majority of female nursing trainees.