Background: Coronavirus is exceedingly contagious, and an effective treatment has yet to be identified. However, its transmission can be halted or slowed by employing preventative measures and remaining informed about the disease and its mode of transmission. Objectives: This study investigates the knowledge, attitudes, and behaviors of Riyadh schoolchildren regarding COVID-19. Method: From April to June of 2022, this cross-sectional research involved students between the ages of 12 and 18 from various schools in Riyadh. The information was gathered via an internet-based survey employing a pre-validated Arabic survey questionnaire. Results: A significant majority of 253 students (91.3%) exhibited a profound comprehension of the transmission of COVID-19. In addition, headache 87.7%, loss of taste and smell 92.5%, and fever 94.5% were the most frequently reported symptoms by students. The high knowledge score was predicted by secondary school students versus intermediate school students (OR=0.243, 95%CI: (0.072-0.819), p<0.05) and elder versus younger students (OR=0.306, 95%CI: (0.092-1.024), p<0.05). A majority of students (69.2%) express support for notifying health authorities of any symptoms they experience, while 71.9% consent to isolation should they come into contact with an infected individual. Preventive measures were practiced with greater zeal by female students compared to male students (P-value <0.0001). Information was obtained primarily through social media. Conclusion: The majority of respondents were informed, held logical views, and took preventative measures against COVID-19. The fact that respondents became aware of COVID-19 through social media demonstrates the positive impact it has had on public health consciousness. Our research may not reflect the knowledge, attitudes, and preventative behaviors of Riyadh pupils regarding COVID-19. It furnishes vital data to aid health organizations in the development and execution of preventive initiatives.