Staphylococcus lugdunensis is a coagulase-negative organism first identified in 1988. It is often incorrectly identified as Staphylococcus aureus, and has been isolated as the etiological agent in over 20 cases of left-sided endocarditis. This report describes the first documented case of right-sided endocarditis caused by S lugdunensis. This experience suggests that S lugdunensis can infect native valves in the absence of any predisposing risk factors such as injection drug use.