Vladislav I (Bulgarian: Владислав I Romanian: Vladhyslao I) of the Basarab dynasty, also known as Vlaicu-Vodă, was a ruler of the principality of Wallachia (a part of modern-day Romania) (1364 – c. 1377).
He was a vassal of the Bulgarian Emperor Ivan Alexander. In 1369 Vladislav I subdued Vidin and recognised Louis I of Hungary as his overlord in return for Severin, Amlaş, and Făgăraş. In 1373 Louis I took Severin again but the Vlachs recovered it in 1376–1377.
Vladislav is the name derived from the old Slavic origin, meaning "to rule with glory" from slavic волод volod (rule) and слав slav (glory).