Chimera – sometimes depicted with the heads of a goat and a lion. The Lernaean Hydra – an ancient nameless serpent-like chthonic water beast that possessed numerous heads. Orthrus – a two-headed dog owned by Geryon. Scylla – sometimes described as a six-headed sea monster.Other multi-headed creatures in Greek mythology include:

The Hecatonchires – giants with fifty heads and one hundred arms. The word "Hecatonchire" means "hundred arms". They were the sons of Gaia, and Uranus. Hecate – Greek goddess of witches, nightmares, crossroads, and one of the Moon deities; sometimes represented with three heads. Iranian mythology
Zahhak, an evil figure in Iranian mythology - also evident in ancient Iranian folklore as Aži Dahāka (Azh dahak) - is the most significant and long-lasting of the ažis of the Avesta, the earliest religious texts of Zoroastrianism. He is described as a monster with three mouths, six eyes, and three heads (presumably meaning three heads with one mouth and two eyes each), cunning, strong and demonic. But in other respects Aži Dahāka has human qualities, and is never a mere animal. Hinduism
Hindu deities are often depicted with multiple arms or heads. The fire-god Agni has two heads
Dattatreya: three
The creator-god Brahma: four
The goddess Gayatri: five
The war-god Kartikeya: sixThough usually depicted with one head, some deities like Ganesha (in Heramba form) and Shiva (Sadashiva) have aspects where they are depicted with multiple heads; five in this case. The Vishvarupa form of Vishnu is described as having infinite heads. Besides deities, demons (asura and rakshasa) may be depicted with multiple heads.
The "Father Bull" is unknown but must have been an outstanding Hereford. The double calf was alive and healthy but died during birth. This calf, or calves, joined from the beginning of the neck as far as the belly, with two complete, almost perfect body frames, had but one system of vital organs. Each of the two normal heads had a food channel to one stomach and a breathing channel, or windpipe, to the one set of lungs. The two briskets, or breasts, shared on each side by these calves, contained the one set of lungs on one side and the one heart on the other side. Branching off from the one stomach and digestive system were two channels of elimination. The calf weighed approximately 85 pounds (39 kg) at birth. The over-all measurements as it stands mounted are: 42.5 inches (1,080 mm) high, 20 inches (510 mm) from tail to tail, and 18 inches (460 mm) from side to side including the front legs. The "Mother Cow" lived and was sold as a "fat cow" in July 1949. This calf was stuffed by C. J. Sanders, taxidermist, 2631 South State Street, Salt Lake City 5, Utah, who stated that it is the most unusual monstrosity he has ever worked with. Dr. A. C. Johnson, of Cedar City, Utah, stated that this was the best specimen of monstrosity in animal life that he has ever seen or heard of in his 47 years of practice as a veterinarian.