Baba Yaga is a supervillain in the comic book series Hellboy. Based on the Slavic folklore character of the same name, the character was created by Mike Mignola. Baba Yaga was a legendary witch of Russian folklore that lived inside a chicken leg house, and counted dead men's fingers. She appeared in the 2019 film Hellboy, portrayed by Emma Tate and Troy James.

In 1895, prior to the downfall of the Romanov's rule in Russia, Baba Yaga contacted a young Grigori Rasputin. She told the monk that the fates had chosen him to be their agent of change, father of the new millennium. To ensure that Rasputin's spirit would always be safe, Baba Yaga placed half of it within the roots of Yggdrasil, the world tree. Baba Yaga and Rasputin gained a strong bond after this, with Rasputin going so far as to call Baba Yaga "grandmother" afterwards.

Ages ago, Baba Yaga took advantage of Koschei's fear of losing his soul. She told him that even though the path he took was dark and bloody, he could still be redeemed. The witch sent him on a quest to slay the last breeding pair of dragons and their hatchlings in Russia so that the mankind may be spared. However, in doing so he murdered the family of his adoptive father.

In March 1964, Hellboy first encountered Baba Yaga while investigating a string of children disappearing. The disappearances were Baba Yaga's doing as she kidnapped the children to satisfy her cannibalistic hunger. When Baba Yaga was counting the fingers of the dead in a cemetery, she attempted to use a skull (that once belonged to a former-devotee named Katayev) to lead her to the Sabbath. Then she was ambushed by Hellboy, who leaped onto her in a sudden attack. During the scuffle, Baba Yaga's left eye was shot out, and she retaliated by attacking Hellboy with the graveyard's tombstones. As a result of her defeat at Hellboy's hands, she placed a curse on the village of Bereznik: there would be no spring that year, and every baby born there would be blind in one eye. Baba Yaga's diminished power causes her to disappear from the world and reside in a pocket dimension created in the image of her Russia as it appeared long ago. On occasion, however, if needed, Baba Yaga can briefly return to the real world.

During the events of Wake the Devil, after having her servant Koku present an iron maiden to Rasputin in his failed attempt to ensure Ilsa Haupstein's survival in the coming apocalypse, Baba Yaga observed Hellboy being cast into the darkness by Hecate alongside Dagda and Edward Grey. During Hellboy's struggles, Baba Yaga believed that he would eventually succumb and destroy the world. She faced disbelief when he did not. Soon after, Baba Yaga meets with Rasputin at Yggdrasil where she tries to convince him to stay with her in her realm, but to no avail. Though Rasputin declined her offer, Baba Yaga collected what remained of his soul after he was dispatched by Hecate in the aftermath of the Conqueror Worm.

In the events of Darkness Calls, after refusing to be their queen after Hecate was disposed of, Baba Yaga asks the witches to give her Hellboy so she can exact her revenge within her world. After the intervention of the Leshii, who offered Hellboy a one night sanctum in his woods, Baba Yaga summoned her greatest servant, Koschei the Deathless, to hunt down Hellboy and bring her his head, or eye, with the promise to release Koschei from his cursed immortality. Baba Yaga kills Perun for his interference in impeding Koschei's progress. After Vasilisa the Beautiful showed Hellboy the way back to his world, while providing him gifts to hinder Koschei, Baba Yaga resorts to infusing her champion with thousands of souls from her collection of skulls and then a fragment of her own soul to take control of Koschei's body.

Drained of almost all her power as Koschei is defeated, Baba Yaga attempted to use Rasputin's soul before a fearful Koku snatched the acorn that contained the evil monk away from her and cast it through the roots of the World Tree into Hell. In a last ditch effort, Baba Yaga ordered Koschei to throw his dagger into Hellboy's back as he ascended to the exit of her world. But this last attempt on Hellboy's life failed, and a now-weakened Baba Yaga is calmly derided by the ghost in black as she is told that Hellboy must give her his eye willingly.

Baba Yaga later appears before Hellboy in The Storm and The Fury, offering to aid Hellboy in reaching Nimue's tower on the condition that he gives her his eye as payment for taking out her original eye, which Hellboy did. After Hellboy's death in the aftermath of his victory against the Queen of Blood, as revealed in the prologue of Hellboy in Hell, Baba Yaga was approached by Edward Grey to be sent into the Abyss to find Hellboy. Though she advised against it, Baba Yaga granted Grey's request.