Cardiovascular disease (CVD) is an umbrella term that includes various pathologies involving the heart and the vasculature system of the body. CVD is the leading cause of death worldwide, accounting for an estimated 32% of all deaths. More than 40% of annual deaths in Jordan are due to CVD; this number is further expected to rise, particularly in the Eastern Mediterranean region where Jordan is located. Due to the chronic nature of CVD, the presence of a caregiver who can help mitigate the challenges patients face is essential, and their level of knowledge determines the quality of care they can provide. Hence, this cross-sectional study was conducted in the cardiology clinics at Jordan University Hospital (JUH). Questionnaires were distributed to 469 participants, defined in this study as the caregivers escorting patients with established coronary heart disease (CHD). The self-administered questionnaire included three sections: sociodemographic and health factors, knowledge of CVD risk factors, and CHD symptoms. The mean age of the study population was 44.38 years ± 15.92 and 54.2% of participants were males. Regarding knowledge of CVD risk factors, 84.6% of participants answered more than 70% of the questions correctly. More than 95% knew that chest pain is a symptom of an acute cardiovascular event. However, only 53.5% and 74.8% of the participants reported that jaw pain and arm pain are symptoms of an acute event, respectively. Several factors influenced the caregiver’s knowledge, such as age, income, frequent health checkups, having a history of CVD, CKD, or DM, and their relationship to the patient. This study sheds light on the importance of caregiver knowledge in patient care. By improving the caregivers’ knowledge, identifying their role in patient care, and raising CVD awareness in susceptible populations, healthcare professionals can improve the patients’ quality of life. Overall, assessing caregivers’ knowledge pertaining to CVD can provide invaluable data, which may enhance patient care by educating their caregivers.