Leo VI, surnamed the Wise or the Philosopher (19 September 866 – 11 May 912), is Byzantine Emperor from 886 to 912.

The second ruler of the Macedonian dynasty (although his parentage is unclear), he is very well-read, leading to his surname.

During his reign, the renaissance of letters begun by his predecessor Basil I continues, but the Empire also sees several military defeats in the Balkans against Bulgaria and against the Arabs in Sicily and the Aegean.