In this study, a checklist of Pycnogonida (Arthropoda) species reported from Turkish seas up to now presented. It has been determined that 8 species from the Turkish Mediterranean Sea, 23 species from the Aegean coasts of Turkey, 7 species from the Bosphorus, 6 species from the Sea of Marmara, and 3 species were reported from the Turkish Black Sea. Totally 27 species belonging to 7 families and 9 genera, their distribution in Turkish seas, depth range of each species and type of substrate were given. Acheliidae dominated with 10 species. Anoplodactylus is the major genus (7 species).