Abstract : The hopes to contain the COVID-19 pandemic, which has been affecting the world for a year, have increased with the development of vaccines. However, wide coverage is needed to successfully control the disease. This study used the theory of planned behaviour to assess the intention and the factors influencing getting COVID-19 vaccine in the Kingdom of Saudi Arabia. Data were collected using an online questionnaire. The results revealed that half the study participants (51.5%) intended to vaccinate. However, a positive attitude (72%) and high perceived behavioural control (86.9%) were noted among the study participants. The theory of planned behaviour successfully predicted the participants’ intention to vaccinate. Nevertheless, perceived behavioural control was found to be a negative predictor. This study recommends normalizing the vaccine and maintaining educational campaigns to improve attitudes and consequently intention and behaviour.