Campylobacter lari and C. hyintestinalis were rarely isolated from the patients with diarrhea. We isolated C. lari from the stool culture of a 37-year-old man with pulmonary tuberculosis and a 48-year-old man with kidney transplanation, and C. hyointestinalis from the stool culture of a 64-year-old woman with gastric cancer. These organisms were isolated on Butzler media, and identified by biochemical characteristics and antimicrobial susceptibility to nalidixic acid and cephalothin. This report suggests that the clinical significance of Campylobacter species must be expanded to include C. lari and C. hyointestinalis as a potential cause of human gastrointestinal disease.