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Leo III, Leon III, or Levon III may refer to:
- Leo III the Isaurian (685-741), Byzantine emperor 717-741
- Pope Leo III (d. 816), Pope 795-816
- Leon III of Abkhazia, King of Abkhazia 960–969
- Leo II, King of Armenia (c. 1236-1289), sometimes referred to as Leo III, ruled from 1269-1289.
- Leo III, King of Armenia (1287-1307), ruled from 1303-1307
- 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 (computer), an early computer used for commercial business applications
| disambiguation page lists articles associated with the title Leo III.
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