Background: The sudden convert from the classroom to online learning is challenge that faced all countries and people also, the researcher had a great role to present how such a shift would impact the worldwide education and its effect of Unplanned Switch to E-Learning during COVID-19 Pandemic. Aim of the study: The study aimed to explore critical care nursing students' acceptance of unplanned switch to e-learning during COVID-19 pandemic from the Saudi and Egyptian perspective.  Materials and method: This study was conducted by using descriptive research design, Settings: This study was conducted at faculty of nursing Alexandria University/ Egypt and Al Riyadh College for health science in Jeddah / Saudi Arabia.  Subjects: A convenience sampling of all critical care nursing students from Alriyada College and all critical care nursing students from Alexandria University students that are facing the sudden switch from face to face to e-Learning during spring 2020 academic year. Tool of data collection: One tool will be used for the purpose of data collection: Extended Technology Acceptance Model to E-learning systems that consist of two main factors, “Perceived Usefulness" and “Perceived Ease of Use" that influence a person's intention to make use of a technology. Results: the result showed more than half of the Egyptian and Saudi students have high level of e-learning self-efficacy. Also, nearly half of the studied samples demonstrated a high level of subjective norms. Also the results revealed that near half of the Egyptian and more than half of the Saudi students demonstrate a high total level of acceptance of e-learning sudden shift Conclusion: The current study findings concluded that considerable number of the Egyptian and Saudi students demonstrate a highly total level of acceptance of E Learning sudden shift. Hence, the current study has proven that e-learning was an effective method of instruction during the pandemics and the crisis and the emergency time of closure. Recommendation: Based on the existing study results, it can be recommended that the educational institutions, if they want to proceeds with online learning, they should focus on increasing students' acceptance and social presence feeling.