Adherence to recommended physical activity after a cardiac event is important to prevent cardiac recurrence. Social support from peers and family is known to improve self-care in chronic illnesses, including cardiovascular disease. However, the relationship between social support from health care providers and physical activity among patients with coronary artery disease remains unclear. This cross-sectional study aimed to identify the relationship between perceived social support from health care providers and physical activity among patients with stable coronary artery disease. The study included 237 patients with stable coronary artery disease attending an outpatient clinic. Hierarchical linear regression found that perceived social support explained 12% of variance in physical activity, F(14, 222) = 7.37, p < .001. In addition, self-efficacy partially mediated the relationships between perceived social support and physical activity. Abundant support from health care providers plays a key role in promoting physical activity among patients with stable coronary artery disease.