Aleksandar Stoychev Mladenov (; born 25 June 1982) is a Bulgarian former professional footballer who played as a midfielder. He is the son of Stoycho Mladenov.
Mladenov was born in Sofia.
He played in Germany for Hertha BSC and Karlsruher SC and in Russia for Tom Tomsk.
On 25 March 2010, Mladenov signed a one-year contract with FC Krasnodar.