We present this case report to provide information about Felicola subrostratus (Burmeister, 1838) (Phthiraptera: Ischnocera) detected on a 2-year-old stray cat (Felis catus) brought for treatment to a veterinary clinic in Kocaeli, Turkey. Macroscopically, severe louse infestation was detected on the cat. Some of the lice on the cat were collected using forceps and preserved in 70% ethanol. Then, they were sent to Department of Parasitology, Veterinary Faculty, Selçuk University in Konya for identification. Samples were examined under a microscope and identified as F. subrostratus (Burmeister, 1838). F. subrostratus has been known to be detected on cats in Turkey, but no study is found about this species. For this reason, in this case report, F. subrostratus was studied to further educate veterinarians and parasitologists in the country.