Leo

Leo or LEO may refer to:
 The Latin word for "lion"
 LEO (computer), the first commercially used computers
 Leo (constellation), a section of the night sky
 Leo Minor, a small constellation
 Leo (astrology), a sign of the zodiac
 LEO (spacecraft), a lunar mission
 Leo (text editor), a computer program
 LEO (website), a group of dictionaries
 Low Earth orbit, a satellite path
 Long-term Ecosystem Observatory, a marine study project

People
 Leo (given name)
 Leo (surname)
 Leonardo
 Leonid
 Leonidas
 Leopold
 King Leo
 Pope Leo
 Saint Leo
 Emperor Leo, several Byzantine emperors
 House of Leo, Byzantine dynasty
 Leo (wrestler), Mexican professional wrestler
 Leonardo DiCaprio, American film actor
 Leonid Brezhnev
 Leonardo

Movies
 Leo (movie), a 2000 Spanish movie by José Luis Borau
 Leo (2002 movie), a 2002 drama by Mehdi Norowzian
 Leo (2007 movie), a 2007 Swedish movie by Josef Fares
 Ultraman Leo, a 1974 tokusatsu movie