ABSTRACT. – Although there are some radio-telemetry studies on badger spatial organization in sub-humid Mediterranean lowlands, cork oak woods and Atlantic highland forest (in the South, West and North of the Iberian Peninsula respectively), the present study is the first carried out in the Mediterranean forests of the NE Iberian Peninsula in the parks of Collserola and Montserrat, close to Barcelona. The home range of 13 adult badgers (6 males and 7 females) was examined with the aim of providing results to compare with previous studies in order to advance in the understanding of badger social organization with special regard to low density populations in Mediterranean environments. Mean home range size was 307.6 ha ± 96.4 (± SE) and 72.8 ha ± 15.1 for males and females respectively for MCP95 and 287.4 ± 79.1 and 85.1 ± 26.6 for FK95 with differences between Parks. In addition, the home ranges of Collserola males were over four times larger than those of females, while for Montserrat this figure was 1.5. Moreover, badger groups were formed by one to three individuals in Collserola, and at least three individuals in Montserrat. This discrepancy points to a distinct social organization associated with differences in population densities (0.6 ind./km² in Collserola and 1.9 ind./km² in Montserrat) and landscape structure conditions. Our results suggest that the home range configuration of males is driven by female distribution in space.