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Individual‐level diet variation was investigated in Gracilinanus microtarsus, an insectivorous marsupial whose diet is affected by sex and season in the highly seasonal Brazilian Cerrado. To measure individual‐level diet variation, the diets of individual males and females were compared to that of their population in the warm‐wet and cool‐dry seasons using the proportional similarity index (PS_i). This index varies from 1 (complete overlap between the individual i 's and population's diets) toward 0 (decreasing overlap). Mean PS_i values were computed as a measure of the degree of interindividual diet variation (the larger the mean PS_i value, the smaller the variation among individuals’ diets). Interindividual diet variation among females was similar between seasons, whereas among males it decreased from the warm‐wet to the cool‐dry season. Diet variation among males is probably reduced in the cool‐dry …