This article is about the mythical creature. See Amphisbaenia for information on the type of reptile.

Amphisbaena, or Amphisbaina (a Greek word, from amfis, both ways, and bainein, to go) is a serpent in ancient mythology, with a head at each end. Its fabled existence has been utilized by the poets, such as John Milton, Alexander Pope, and Alfred, Lord Tennyson. It could chase its prey by putting one head in the other's mouth and rolling after it like a hoop.