A pre-experimental research study was conducted to assess the effectiveness of video assisted teaching module on knowledge regarding Breast Self Examination (BSE) among girls in a selected school of nursing, Dehradun, Uttarakhand. A Structured Knowledge Questionnaire was prepared and used to collect the data and to assess the knowledge among ANM students regarding BSE. Descriptive and inferential statistics were used for data analysis. Findings revealed that the pre-test knowledge score of ANM 1st year students' shows majority (67.1%) had average knowledge, while 25.7% had below average knowledge and 7.1% had above average knowledge. The knowledge score of ANM 1st year students in post-test shows majority (95.8%) acquired above average knowledge while, 4.2 % had average knowledge and none of them had below average knowledge. The calculated value of paired t-test is 25.84 which is greater than the tabulated value of paired t-test with 69 degree of freedom i.e.2. It shows that the video assisted teaching module was effective as there is a highly significant increase in the post-test knowledge scores than the pre-test knowledge scores among ANM 1st year students on BSE. The demographic variables have statistically significant associa ion with the age and marital status regarding BSE