A number of historical people were named Alexander I :
- Alexander I of Epirus King of Epirus about 342 B.C
- Pope Alexander I, Pope from 106 to 115.
- Alexander I of Scotland (c. 1078-1124), King of Scotland.
- Alexander I of Russia (1777-1825), Czar of Russia.
- Alexander I of Georgia (1412-1442), King of Georgia