Dietary studies are critical to an understanding of elasmobranch ecology and the impacts of their loss (via fishing and by-catch) from marine ecosystems. The eastern fiddler ray (Trygonorrhina sp. A) is a common by-catch component of demersal fish trawls in NSW, but impacts of their removal are not known. Stomach contents of 102 rays (46 females, 56 males) collected from a commercial fishery operating near Newcastle in summer and autumn 2007 were analysed. Their broad diet was dominated (%W) by brachyurans, teleosts, cephalopods and penaeids. Significant changes in diet occurred between summer and autumn, with brachyurans typical of summer and penaeids typical of autumn. Significant size-based dietary differences were due to the variable dominance of different items among size classes: penaeids and amphipods (<20 cm DW), brachyurans (25 cm DW), and teleosts and cephalopods (>30 cm DW). Brachyurans were typical of all size classes. Significant sex-based differences were caused by varying consumption of diogenid, crustaceans, and cephalopods. Brachyurans and penaeids were consumed by both sexes. This study is the first quantitative analysis of the diet of Trygonorrhina sp. A providing an indication of their contribution to food webs and ecosystems.