There have been several people named Alexius
- Alexius I Comnenus -- (1048-1118), Byzantine emperor
- Alexius II (1167-1183), Byzantine emperor
- Alexius III, Byzantine emperor
- Alexius IV, Byzantine emperor
- Alexius V, Byzantine emperor
- Alexius Mikhailovich (1624-1676), tsar of Muscovy
- Alexius Petrovich (1600-1718), Russian tsarevich