ABSTRACT. – In Tunisia, while wetlands are considered as remarkable habitats for their faunal and floral diversity, few studies on the species diversity of terrestrial isopods have been performed. To fill this gap, the spatiotemporal distribution of Oniscidea at the lagoon complex of Ichkeul (north-east of Tunisia) was studied. Sampling was carried out with the method of quadrate along a perpendicular transect to the shoreline in three stations located inside this complex. Seven species of terrestrial isopods belonging to four families were identified. Whatever the season or the station, Chaetophiloscia elongata was the most abundant species; its relative abundance ranged from 56.8 % (station 2, spring) to 100 % (station 1, winter). The highest densities per quadrate were recorded in summer at 7 m distance from the shoreline for S1 (548 ind.m2), at 8m for S2 (136 ind.m2) and at 3 m for S3 (248 ind.m2). The distribution of Chaetophiloscia elongata, Porcellio lamellatus, Armadillidium pelagicum, Porcellio laevis and Tylos europaeus was positively related to soil moisture.