Coarctation of the thoracic aorta is not often diagnosed after childhood. The combination of subclavian artery aneurysm in association with coarctation of the aorta is even less frequent. A review of the literature elicited only seven previously reported cases of such an association. Presented herein is a case of a young adult with coarctation of the aorta and secondary left subclavian artery aneurysm, diagnosed incidentally. We discuss the incidence of these rare conditions and possible causes for their co-existence.