Mnevis (, ) is the Hellenized name of an ancient Egyptian bull god which had its centre of worship at Heliopolis, and was known to the ancient Egyptians as Mer-wer or Nem-wer.
Although initially a separate god, it was later assimilated to the syncretized god Atum-Ra as his physical manifestation, and also considered as the ba of Ra. Mnevis is often depicted as a black bull wearing a solar disk and uraeus.