Drekavac (literally "the screamer" or "the screecher"), also called drekalo, krekavac, zdrekavac or zrikavac, is a mythical creature in South Slavic mythology. The name is derived from the verb "drečati" ("to screech").

In South Slavic mythology and folk tales this creature has been variously described:

A modern description of a supposed drekavac describes it as a canine creature similar to a dog or some kind of bird.

The drekavac was originally thought to have come from the souls of sinful men, or from children who died unbaptised.

It was popularly believed to be visible only at night, especially during the twelve days of Christmas (called unbaptised days in Serbo-Croatian) and in early spring, when other demons and mythical creatures were believed to be more active. When assuming the form of a child, it predicts someone's death, while in its animal form, it predicts cattle disease. The drekavac is believed to avoid dogs and bright light. Also, it is believed that if the shadow of drekavac falls upon some person then that person will turn sick and die.

Although the creature is mostly used in cautionary tales for children, there are also some adults who still believe in its existence. According to the guide of a reporter of Duga magazine, numerous villagers on the mountain of Zlatibor report seeing it, and many inhabitants claim to have heard it.

Some modern sightings happened: