Thornback

Thornback may refer to:

Fish

 * Thornback guitarfish (Platyrhinoidis triseriata), a species of ray in the north-eastern Pacific Ocean
 * Thornback ray (Raja clavata), also known as the Thorback skate, a species of ray in the Atlantic Ocean
 * Thornback skate (Dentiraja lemprieri), a fish endemic to Australia

Other

 * USS Thornback (SS-418), a submarine
 * Phaerimm, a fictional species of creatures in Dungeons & Dragons
 * Spinster