Basil I the Macedonian (c. 811–886) was a Byzantine emperor and founder of the Macedonian dynasty.
Basil I may also refer to:
- Basil I of Constantinople, surnamed Scamandrenus, Patriarch of Constantinople 970–974
- Basil I of Bulgaria, Patriarch of Bulgaria c. 1186–c. 1232
- Basil I of Russia (1371–1425), Grand Prince of Moscow and Vladimir 1389–1425
- Vasilije, Serbian Patriarch in 1763–1765
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