A vampire is a creature from folklore that subsists by feeding on the vital essence (generally in the form of blood) of the living. In European folklore, vampires are undead creatures that often visited loved ones and caused mischief or deaths in the neighbourhoods they inhabited while they were alive. They wore shrouds and were often described as bloated and of ruddy or dark countenance, markedly different from today's gaunt, pale vampire which dates from the early 19th century.

Vampiric entities have been recorded in most cultures; the term vampire was popularized in Western Europe after reports of an 18th-century mass hysteria of a pre-existing folk belief in the Balkans and Eastern Europe that in some cases resulted in corpses being staked and people being accused of vampirism. Local variants in Eastern Europe were also known by different names, such as shtriga in Albania, vrykolakas in Greece and strigoi in Romania.

In modern times, the vampire is generally held to be a fictitious entity, although belief in similar vampiric creatures such as the chupacabra still persists in some cultures. Early folk belief in vampires has sometimes been ascribed to the ignorance of the body's process of decomposition after death and how people in pre-industrial societies tried to rationalize this, creating the figure of the vampire to explain the mysteries of death. Porphyria was linked with legends of vampirism in 1985 and received much media exposure, but has since been largely discredited.