The Heraion of Argos was the temple in the greatest sanctuary in the Argolid, dedicated to Hera, whose epithet "Argive Hera", is familiar to readers of Homer. Hera herself claims to be the protector of Argos in Iliad IV, 50–52): "The three towns I love best are Argos, Sparta and Mycenae of the broad streets". The memory was preserved at Argos of an archaic, aniconic pillar representation of the Great Goddess.
The site, which might mark the introduction of the cult of Hera in mainland Greece, lies northeast of Argos between the archaeological sites of Mycenae and Midea (Argolid), two important Mycenaean cities. The traveller Pausanias, visiting the site in the 2nd century CE, referred to the area as Prosymna (Προσύμνη).