Corynebacterium propinquum, which is classified as Corynebacterium ANF-3, has not yet been described as a cause of the respiratory infections. In this paper, we reported a case of 67-year-old immunocompetent male with community-acquired pneumonia caused by C. propinquum. Our study suggested that Gram staining of the pulurent sputum was the most important diagnostic tool to determine the pathogenecity of this organism.