Any of several species of North American freshwater catfish in the genus Ictalurus, valued as food and sport fishes. Bullheads are related to the channel catfish (I. punctatus) and other large North American species, but their tail is squared, rather than forked, and they are generally less than 12 in. (30 cm) long. The black bullhead (I. melas) is found in the Mississippi Valley, the yellow and brown bullheads (I. natalis and I. nebulosus) east of the Rocky Mtns., and the flat bullhead (I. platycephalus) in coastal streams between North Carolina and Florida. The name is sometimes applied to sculpins.

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• Kinds of fish, including:
• Certain sculpins, including:
• European bullhead, Cottus gobio
• Siberian bullhead, Cottus poecilopus
• Norway bullhead, Taurulus Liljeborgi
• Bullhead catfish, genus Ameiurus, including:
• Black bullhead, Ameiurus melas
• Brown bullhead, Ameiurus nebulosus
• Yellow bullhead, Ameiurus natalis
• Other catfishes, including:
• Korean bullhead, Pseudobagrus fulvidraco
• Black bullhead, Pseudobagrus koreanus
• African bullhead, Lophiobagrus cyclurus
• Bullhead sharks
• Places:
• Bullhead City, Arizona
• Bullhead, South Dakota
• Bullhead Dam
• Tamiya Bullhead, a toy
• Bullhead (album), by the Melvins
• Bullhead rail, a particular cross-section of rail used in railway track construction
• The Bull's Head, a London jazz club
• USS Bullhead (SS-332), the last US Navy ship sunk by enemy action during World War Two