In Polish mythology, Czarnobóg (char-NOH-book) is the evil god of the waning year.

The name derives from "czarne", meaning black.

Czarnobóg is one of the sources of inspiration for Mussorgsky’s "Night on Bald Mountain", where he is portrayed as the Black God of evil, woe, and grief.

Czarnobóg is also known as the God of Chaos and Night and as the Black God of the Dead.

Czarnobóg was the counterpart and brother of Bialobóg (byah-WOH-book), the White God of the waxing year.