This study examined whether purpose in life was associated with myocardial infarction among a sample of older adults with coronary heart disease after adjusting for relevant sociodemographic, behavioral, biological, and psychological factors. Prospective data from the Health and Retirement Study-a nationally representative panel study of American adults over the age of 50-were used. Analyses were conducted on the subset of 1,546 individuals who had coronary heart disease at baseline. Greater baseline purpose in life was associated with lower odds of having a myocardial infarction during the 2-year follow-up period. On a six-point purpose in life measure, each unit increase was associated with a multivariate-adjusted odds ratio of 0.73 for myocardial infarction (95% CI, 0.57-0.93, P = .01). The association remained significant after controlling for coronary heart disease severity, self-rated health, and a comprehensive set of possible confounds. Higher purpose in life may play an important role in protecting against myocardial infarction among older American adults with coronary heart disease.