The control of the Coronavirus Disease 2019 (COVID-19) pandemic may be dependent on widespread receipt of an effective vaccine. The success of the COVID-19 vaccination program is dependent on people's knowledge , attitude and behaviour regarding the vaccination program.. Aim: the study aimed to assess the effect of an educational program regarding COVID 19 vaccination on maternity student nurses' knowledge, attitude and behaviour. Study design: A Quasi-experimental using in our study, one group (pre/post-test ) were studied. Setting: The study was carried out in the Faculty of Nursing at Benha University. Sampling: A purposive sample of 246 maternity student nurses were included in our study