Chlamydia pneumoniae strains have been recovered from arteriosclerotic coronary arteries, but their antibiotic susceptibility profiles have not get been examined, We report in vitro susceptibility data for five cardiovascular C. pneumoniae isolates. These strains did not differ significantly from respiratory strains in their patterns of susceptibility to azithromycin, erythromycin, roxithromycin, ofloxacin, doxycycline, rifampin, and penicillin G. Roxithromycin was the most active macrolide, and rifampin was the most effective drug overall.