The diet of weasel (Mustela nivalis) collected in agricultural mosaic plain regions of Hugary was studied using the analysis of stomach and rectum contents (n = 155). As a percentage relative frequency of occurrence, diets consisted of 85% small rodents (mainly Microtus spp.), 10% birds (mainly Passeriformes), and lizard, wasp, blood and plant matter. Consumption of small mammals increased from winter to summer and autumn. No predation on lagomorphs was found. Standardized trophic niche breadth was very narrow (mean, Bsta= 0.07). The food consisted of characteristically small (15–50 g) and terrestrial prey.