Ubour: Bulgarian. This Vampire is created when a person dies violently or the spirit refuses to leave the body. The corpse is buried and remains so for forty days, at which time it will rise and cause mischief. It will not generally drink blood until its other sources of nourishment are gone, which includes the consumption of regular food, thus the attacking of humans rarely occurs. It is also said that when the Ubour moves around, sparks are created.

Upior: Polish name for Vampire.

Up�r: This vampire was thought to have had two souls: a vampire was a corpse animated by one of the souls, the lesser soul, that remained in the body after death. It had two hearts, and was known to have its eyes open while in the grave, two curls in its hair and various other vampiric signs. Also known as nelapsi.

Upierczi: Vampires who originate in Poland and Russia, also called Viesczy. They have a sting under the tongue instead of the fangs and are active from noon to midnight. They can only be destroyed by burning. When burned, the body will burst, giving rise to hundreds of small, disgusting animals (maggots, rats, etc.). If any of these creatures escape then the Upierczi's spirit will escape too and return later for revenge.

Upirina: See Vrykolakas.

Upyr: Russian. This Vampire is considered extremely vicious; it will first attack children and then continue by killing the parents. As with the Upier, the Upyr rises during the day and sleeps at night, and in doing so holds a fairly human appearance.

Ustrel: A Bulgarian vampire whose birth had been on a Saturday but died before its baptism. On the ninth day of its burial, it is believed to rise from the grave and attack local sheep and cattle, draining their blood. If an Ustrel was attacking a community's livestock, one could hire a vampirdzhija, or vampire hunter. This person had an ability to see the Ustrels, and could tell if there was an Ustrel in the community.

Utukku: Babylonian. This Vampire spirit, sometimes seen as a demon, is belived to be the spirit of a recently deceased person that has returned from the grave for some unknown reason.