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Measures of δ¹³C and δ¹⁵N in tissues of Asiatic black bears (Ursus thibetanus) can be useful in helping researchers identify nuisance bears and in determining whether a specific bear might be consuming anthropogenic food such as garbage and corn. However, the δ¹³C and δ¹⁵N values of native foods vary across the bear’s range. The purposes of this study were to characterize the stable isotope ratios of bear tissues and potential non-anthropogenic food items and compare that characterization to other studies and an independent analysis of bear food habits. We collected hair from bears in the Ashio–Nikko Mountains (ANM) that, based on capture location and radiotelemetry data, were consuming non-anthropogenic food. We found that the δ¹³C ratios of bear hair from the ANM were significantly higher than those of bears sampled in another area in central Japan where bears were also eating native …