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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