The Great Altar of Unconquered Hercules (Latin: Herculis Invicti Ara Maxima)[a] stood in the Forum Boarium near the Tiber River in ancient Rome.

It was the earliest cult location of Hercules in Rome, possibly originally dating as early as the 6th century bc.

The rites at the Ara Maxima were unique within the cult of Hercules in that they were performed in the Greek fashion (ritu Graeco) with uncovered heads.

[4] Surviving sources also state on the authority of Varro that women were excluded from the ceremonies at the altar and from partaking in the sacrificial meat.

[5] A tentative identification of a tuff platform in the crypt of Santa Maria in Cosmedin with the foundation of the altar has been made by Filippo Coarelli and other archaeologists.