Vasko Mladenov (Bulgarian: Васко Младенов, born 30 July 1989) is a former professional Bulgarian tennis player. On 6 June 2016, he reached his highest ATP singles ranking of World No. 637 in June 2016 whilst his best doubles ranking was No. 359 in June 2016. Mladenov is a winner of seventeen ITF titles in doubles. Mladenov is also a two time Bulgarian National Champion (2016 and 2017). He participated in the Davis Cup in doubles in March 2016 against Turkey, bringing Bulgaria a historic win 7:6, 6:7, 6:7, 7:6, 6:4 alongside fellow Bulgarian Alexander Lazov.