Egyptian *ri:ʕu, is the ancient Egyptian sun god. By the Fifth Dynasty he had become a major deity in ancient Egyptian religion, identified primarily with the mid-day sun. The meaning of the name is uncertain, but it is thought that if not a word for 'sun' it may be a variant of or linked to words meaning 'creative power' and 'creator'.
The chief cult centre of Ra was Heliopolis (called Iunu, "Place of Pillars", in Egyptian), where he was identified with the local sun-god Atum. Through Atum, or as Atum-Ra he was also seen as the first being and the originator of the Ennead, consisting of Shu and Tefnut, Geb and Nut, Osiris, Set, Isis and Nephthys.

In later Egyptian dynastic times, Ra was merged with the god Horus, as Re-Horakhty ("Ra, who is Horus of the Two Horizons"). He was believed to rule in all parts of the created world the sky, the earth, and the underworld. He was associated with the falcon or hawk. When in the New Kingdom the god Amun rose to prominence he was fused with Ra as Amun-Ra. During the Amarna Period, Akhenaten suppressed the cult of Ra in favour of another solar deity, the Aten, the deified solar disc, but after the death of Akhenaten the cult of Ra was restored.
The cult of the Mnevis bull, an embodiment of Ra, had its centre in Heliopolis and there was a formal burial ground for the sacrificed bulls north of the city.
All forms of life were believed to have been created by Ra, who called each of them into existence by speaking their secret names. Alternatively humans were created from Ra's tears and sweat, hence the Egyptians call themselves the "Cattle of Ra." In the myth of the Celestial Cow it is recounted how mankind plotted against Ra and how he sent his eye as the goddess Sekhmet to punish them. When she became blood thirsty she was pacified by mixing beer with red dye.