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In people with Coronary Heart Disease (CHD), poor adherence to medication, exercise, and dietary recommendations can compromise prognosis. This study investigated respective associations of the Commonsense Self‐Regulation Model (CSM), the Transtheoretical Model (TM), and trait affect with patients’ self‐reported adherence to treatment. One hundred and forty‐two CHD outpatients completed the Illness Perceptions Questionnaire Revised, Self‐Efficacy, Stage of Change, Positive and Negative Affect Scale, and General Adherence Questionnaire. Stage of change and self‐efficacy were associated with self‐reported medication, diet, and exercise adherence. In comparison, the CSM accounted for a smaller proportion of variance in adherence. In hierarchical regression, the variance from CSM variables associated with exercise adherence was no longer significant when TM variables were in the equation …