Egeria, in Roman religion and mythology, goddess or nymph of fountains. Consort and adviser of King Numa, she was also identified with Diana and worshiped as a goddess of childbirth. The name is used as an epithet for a female adviser or companion.

The name Egeria may refer to—

• Egeria (mythology), a mythological water nymph and the wife of Numa Pompilius, second king of Rome. She is shown on the coat of arms of Ariccia.
• a synonym of counsel, from the nymph
• USS Egeria (ARL-8), a U.S. Navy repair ship named after the nymph
• Egeria (pilgrim), also called Aetheria, a fourth century Christian woman, sometimes assumed to be a nun, who made a pilgrimage to the Holy Land and wrote a letter about her travels
• 13 Egeria, an asteroid
• Egeria (genus), a genus of aquatic plants
• "Egeria" (Rome), an episode of the television series Rome
• Egeria, a character in the science fiction television series Stargate SG-1