The aim of this work was to present a preliminary knowledge of the parasitic copepods of marine fish of Turkey. In this study, four parasitic crustaceans were reported from five different fish species found in Turkish seas: Lepeophtheirus europaensis (Zeddam, Berrebi, Renaud, Raibaut & Gabrion, 1988) was found on the gills of the European flounder, Platichtys flesus (Linnaeus, 1758 (Pleuronectidae); Nerocila bivittata (Risso, 1816) on caudal peduncles of east Atlantic peacock wrasse, Symphodus tinca (Linnaeus, 1758) (Labridae); Ceratothoa oestroides (Risso, 1826), on the mouth base of European pilchard, Sardina pilchardus (Walbaum, 1792) (Clupeidae); Anilocra physodes (Linnaeus, 1758), on the body surface of gilthead seabreams, Sparus aurata Linnaeus, 1758 (Sparidae) and on horse mackerel, Trachurus trachurus (Linnaeus, 1758) (Carangidae). Also, a list of the parasitic copepods previously reported from marine fishes of Turkey since 1931 is given, with a new report of the host species, the localities where they were collected and the corresponding authors. At the present time, 23 parasitic copepods have been recorded from 25 host fish of Turkish coasts. Lepeophtheirus europaensis Zeddam, Berrebi, Renaud, Raibaut & Gabrion, 1988 was reported for the first time in Turkish coastal waters.