Mladenov (Bulgarian: Младенов), feminine Mladenova (Bulgarian: Младенова) is a Bulgarian surname derived from the first name Mladen. It may refer to:

• Aleksandar Mladenov (born 1982), Bulgarian footballer
• Atanas Mladenov (born 1960), Bulgarian high jumper
• Daniel Mladenov (born 1987), Bulgarian footballer
• Dessislava Mladenova (born 1988), Bulgarian tennis player
• Dimitar Mladenov (born 1962), Bulgarian footballer
• Georgi Mladenov (born 1962), Bulgarian basketball player and coach
• Hristo Mladenov (1928–1996), Bulgarian footballer
• Ivaylo Mladenov (born 1973), Bulgarian long jumper
• Lachezar Mladenov (born 1972), Bulgarian footballer
• Lazar Mladenov (1854–1918), Bulgarian priest
• Mladen Mladenov (born 1957), Bulgarian wrestler
• Nedyalko Mladenov (born 1961), Bulgarian footballer
• Nickolay Mladenov (born 1972), Bulgarian politician, UN diplomat
• Nikola Mladenov (1964–2013), Macedonian journalist
• Petar Mladenov (1936–2000), Bulgarian communist politician, Bulgarian head of state 1989–1990
• Stefan Mladenov (1880–1963), Bulgarian linguist
• Stoian Mladenov, Bulgarian footballer
• Stoycho Mladenov (born 1957), Bulgarian footballer
• Stoycho Mladenov Jr. (born 1985), Bulgarian footballer
• Vasko Mladenov (born 1989), Bulgarian tennis player
• Yuri Mladenov (born 1977), Bulgarian boxer

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