Background: Nursing students are the future of health care providers, their quality of training and teaching will definitely affect the outcomes of their clinical services provided to patients, so their knowledge, attitude and health preventive behaviors will definitely affect the prevention of COVID19. Aim of the study: to assess the preventive health behaviors among faculty of nursing students regarding COVID19. Research design: A descriptive exploratory research design was utilized. Setting: The study was conducted in seven different scientific department of faculty of nursing affiliated to Ain Shams University. Study subjects: A stratified sample of all faculty (360) nursing students of different specialties during academic year 2020-2021. Data collection tools: Nursing Students selfadministered questionnaire which composed of (demographic characteristics and nursing Students knowledge regarding COVID19), COVID19 preventive health behaviors scale Tool &Attitude scale regarding corona virus. Results: 47.8% of the studied students had average level of total knowledge about the COVID19. 50.5% of the studied students had average performance of total preventive health behaviors regarding COVID19,55% of the studied students had positive attitude regarding COVID19. Conclusion: there was highly significant positive correlation between students' knowledge, preventive health behaviors and their attitude regarding COVID19.Recommendation: Preventive health behavior courses should be included in the curriculum of all departments at faculty, educational programs and workshops about the preventive health behavior about COVID-19 for faculty students at certain intervals, the study should be replicated on different universities in order to generalize the results.