In Egyptian mythology, the Ogdoad (Greek "ογδοάς", the eightfold) were eight primordial deities worshipped in Hermopolis during what is called the Old Kingdom, the third through sixth dynasties, dated between 2686 to 2134 BC.

The concept of an Ogdoad also appears in Gnostic systems of the early Christian era, and was further developed by the theologian Valentinus (ca. 160 AD).