This guide contains the illustrated key to orders, families, genera and species to the Chondrichthyes of the Mediterranean and Black Seas (FAO fishing area 37), currently represented by 38 sharks, 48 batoids and 2 chimaeras. The species are described following the taxonomic order and are grouped in functional groups. Near the illustration of each species, the relevant diagnostic features are complemented by a set of icons representing the management measures and the data collection requirements as per existing GFCM recommendations. The technical terms and the minimum standard measurements are provided as annexes.