This dataset presents the concentrations of chemical contaminants of emerging concern (CECs) in common dolphins (Delphinus delphis) from the Bay of Biscay (NE Atlantic). Tissue samples of liver and blubber were collected on a total of 61 individuals between 2000 and 2023. These individuals encompass 51 stranded animals recovered by local stranding networks and 9 bycaught individuals directly observed on board (dead animals). The targeted CECs inc [...]