Leo III
Leo III, Leon III, or Levon III may refer to:
- Armenian kings
- People
- Leo III the Isaurian (685–741), Byzantine emperor
- Pope Leo III (d. 816), contemporary of Charlemagne
- Leo Fernández III (b. 1959), Puerto Rican reporter
- Leon III of Abkhazia, king of the Kingdom of Abkhazia (960-969), of the House of the Anosids (Anchabadze)
- Other uses
- Leo A, an irregular galaxy in the constellation of Leo
- The Oath of Leo III, 16th century painting about the 9th century Pope Leo III
- LEO III, the early computer used for commercial business applications.