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Bacterial wilt disease (Ralstonia solanacearum) is one of the main cause decrease of potato production. This study aimed to determine that the diversity of endophytic bacteria and phyllosphere isolated from potato tissue can suppress the development of bacterial wilt disease (R. solanacearum). Both bacteria endophytic and phyllosphere isolated from the tissue tip, leaves, stems, tubers and roots cultivated in nutrient agar (NA). Selection of potential bacteria as biological agent use inhibition test method through suspension of bacteria R. solanacearum with concentration 108 plated on NA medium, then dipped paper disc plated on the medium. The result of study showed that the diversity of the bacteria endophytic found 28 isolates. Meanwhile, phyllosphere bacteria found 13 isolates. Inhibition test results showed that of a total of 41 isolates, 16 isolates were able to inhibit bacterial wilt disease (R. solanacearum) with strong inhibition until very strong criteria.