Blackheart is a fictional character in the Marvel Comics universe. He is a demon, the son of Mephisto. He first appeared in the pages of Daredevil, and went on to menace Ghost Rider, The Punisher and Wolverine. Blackheart once killed Mephisto and briefly ruled his Hell-like dimension, but he was deposed by the Ghost Rider; his father later returned to life and took control of that realm. Blackheart was most recently seen as the Black King of the Hellfire Club.

Blackheart is also a playable character in several entries in the Marvel VS. Series of video games.