Daniel Ventsislavov Mladenov (; born 25 May 1987) is a Bulgarian professional footballer who plays as a winger and is currently a playing manager at Kyustendil.
Mladenov started his career in his home town Kyustendil in the local team, Velbazhd.
In June 2007, Mladenov signed a contract for three years with Marek Dupnitsa.
One year later, in 2008, Daniel signed with PFC Pirin Blagoevgrad.
On 9 June 2010, he signed his 3-year contract. On 30 June 2010, he made his unofficial debut for Levski in a match against FCM Târgu Mureà Â. Mladenov entered the match as a substitute and scored 2 goals.
Mladenov officially debuted for Levski in a Europa League match against Dundalk F.C. The Blues won the first match and the result was 6:0. Mladenov scored two of the goals.
On 16 December 2010, Mladenov netted the only goal (right at the end of the first half) for Levski Sofia in the 1:0 home win against Sporting CP in the final UEFA Europa League match of the group phase. However, the team from Sofia had already been eliminated from the competition.
On 3 August 2012, he signed a 2-year contract with Chernomorets Burgas for free. On 13 December, he was arrested for illegal betting. Three days later he was released from the club. However, he did not face any legal charges.
In February 2013, Montana acquired the services of Mladenov until the end of the 2012/13 A PFG season. At the end of season, his contract had expired.
On 2 June 2013, Mladenov played one match for Marek Dupnitsa in the amateur V Group against Slivnishki geroi and scored a goal.
On 5 June 2013, he was signed by Cherno More.
Mladenov earned his first cap for Bulgaria on 7 September 2019, coming on as a late second-half substitute for Galin Ivanov in the 0:4 away loss against England in a UEFA Euro 2020 qualifier.