Background: Coronavirus Disease 2019 is a respiratory disease caused by severe acute respiratory syndrome – coronavirus2. In 2019, COVID-19, a novel coronavirus, has triggered a new respiratory ailment pandemic in Wuhan, China. In December 2020, the Kingdom of Saudi Arabia has begun the distribution of the Pfizer-BioNTech COVID19 vaccination for children, making it the first Arab country to do so. Studies have shown that many variables impact parents' decisions to vaccinate their children. Aim: was to assess parents‟ knowledge and beliefs about the COVID19 vaccine for children at Al-Baha city- Kingdom of Saudi Arabia. Design: Descriptive cross-sectional research design was conducted using simple random sampling on 268 parents at Al-Baha city- KSA, who have children aged between 12-18 years old, during the period from September to December 2021. Tools of data collection: Questionnaire sheet which consists of three parts Part I: to assess socio-demographic characteristics of studied sample. Part II and III: to determine parents' knowledge and belief concerning the covid-19 vaccine for children. Results: 86.2% of children in the study sample received the two doses of COVID-19 vaccination. There is a significant relationship between knowledge and beliefs about the COVID19 vaccine, also, between child sex and parents‟ knowledge, and between the source of COVID-19 vaccine information, and parents‟ knowledge. Conclusion: Most parents have good knowledge about COVID19 for children, and there is a significant correlation between child sex, source of COVID-19 vaccine information, and parents‟ knowledge. Recommendations: Educational training program for parents of children to increase knowledge and modify their beliefs about covid19 and to reduce the incidence of it.