In biology, a copperhead is any of four species of venomous snake: the American copperhead of eastern North America, and three species of Australian copperhead.

Other uses of the term copperhead:

• "Copperheads" was a slur describing a group of Northern Peace Democrats who opposed the American Civil War while it was under way, wanting an immediate peace settlement. They were also against emancipation, and some formed groups to persuade Union soldiers to desert, and to help Confederate prisoners of war escape. The name Copperheads was given to them by Republicans, explicitly comparing them to venomous snakes that strike without warning.
• In rock climbing, a copperhead is a small nut, once made of copper or brass, but now usually of aluminium.
• Copperhead is a brand of BBs and pellets.
• The M712 Copperhead is a guided artillery shell. [1]
• Copperhead is a DC Comics supervillain who is a member of the Secret Society of Super-Villains.
• Copperhead is a Marvel Comics supervillain who is a member of the Serpent Society.
• Copperhead was a band including ex-Quicksilver Messenger Service guitarist John Cipollina.
• Copperhead is the codename of Vivica A. Fox's character Vernita Green in the movie Kill Bill, directed by Quentin Tarantino.
• Copperhead is a slang term referring to a ginger-haired person.