Czernobog (also spelled Chernobog) is a god of darkness and evil in Slavic mythology. He is often considered the counterpart to Byelobog, the god of light and goodness, and together they were believed to control the balance of good and evil in the world.

Czernobog was associated with the powers of darkness, chaos, and destruction. He was believed to bring misfortune, illness and bad luck to those who angered him. He was also associated with death, and was invoked for protection against accidents and diseases.

In Slavic folklore, Czernobog is often portrayed as a malevolent figure, who is responsible for causing harm and misfortune to people. He was also considered the ruler of the underworld and the dead. In some Slavic cultures, Czernobog was also considered the god of chaos and was invoked to bring about change and destruction.

Czernobog was honored in various rituals and ceremonies throughout the year, particularly during the winter solstice, which was considered the time of his greatest power. These rituals often involved offerings of food and drink to the god, as well as the sacrifice of animals.

In modern times, Czernobog is not as well-known as some other Slavic gods, such as Perun, and is not widely worshiped. However, he is still remembered in Slavic folklore and literature, and some modern pagan movements, such as Rodnovery, have sought to revive the worship of the Slavic gods and goddesses, including Czernobog.