Leo (♌︎) (Ancient Greek: Λέων, romanized: Léōn, Latin for "lion") is the fifth sign of the zodiac. It corresponds to the constellation Leo and comes after Cancer and before Virgo. The traditional Western zodiac associates Leo with the period between about July 23 and August 22, and the sign spans the 120th to 150th degree of celestial longitude.

Leo is associated with fire, accompanied by Aries and Sagittarius, and its modality is fixed. The constellation Leo is associated with the mythological Nemean lion. The lion is a very important and prominent symbol in Greek mythology.