Image of a "dogfish" from The New Student's Reference Work (1914), probably depicting a scyliorhinid shark.

Dogfish can have many meanings, but usually refers to a type of shark:

• A shark belonging to the order Squaliformes, or to one of its constituent families:

• Family Centrophoridae (gulper sharks)
• Family Dalatiidae (kitefin sharks)
• Family Echinorhinidae (bramble sharks)
• Family Etmopteridae (lantern sharks)
• Family Oxynotidae (rough sharks)
• Family Somniosidae (sleeper sharks)
• Family Squalidae (dogfish sharks), and in particular the spiny dogfish (Squalus acanthias)

• A shark belonging to the family Scyliorhinidae (catsharks), and in particular the small-spotted catshark (Scyliorhinus canicula) or the nursehound (Scyliorhinus stellaris)
• A shark belonging to the genus Mustelus (smoothhounds), and in particular the smooth dogfish (Mustelus canis)
• An alternate common name for:

• Grey nurse shark (Carcharias taurus)
• Nurse shark (Ginglymostoma cirratum)
• Spanish hogfish (Bodianus rufus)
• Bowfin (Amia calva)

• The USS Dogfish (SS-350), a U.S. Navy submarine
• The Dogfish Head Brewery, a Delaware-based beer brewery

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