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The diet of Ocellated Lizard, a reptile considered as vulnerable in Europe, was studied in a protected area containing one of the most important French populations of the species. It aims to describe diet composition and its temporal variation but also to identify differences between age classes. A sample of 221 scats was collected from May to September 2010 in seven different sites of the studied area (Crau plain, France). From the 4029 items analysed, 156 taxa were identified. The diet is composed by Coleoptera (26.7 %), Orthoptera (23 %), Hymenoptera (19.3 %) and fruits (17.1 %). Dung beetles represent only 2.1 % of Coleoptera prey, which is surprising for such a heavily grazed area. The diet composition is different from one month to another (chi(2) = 943.173, df = 20, p < 0.001) and differences between age classes exist (V = 572, p < 0.001). Adult lizards eat more fruits than juveniles in August (chi(2) = 80.349, df = 1, p < 0.001). The prey richness is not different between adults and juveniles (Z = 1.839, p > 0.05). Finally, diet characteristics in the Crau plain are discussed and compared to other Iberian and French Ocellated Lizard populations.