Nedyalko Mladenov (Bulgarian: Недялко Младенов; born 7 August 1961) is a former Bulgarian footballer who played as a defender.

Mladenov spent the majority of his playing career with CSKA Sofia, where he won three A Group titles, five Bulgarian Cups and three Cups of the Soviet Army. He captained the team during the 1987–88 season.

After seven seasons at CSKA, Mladenov joined French Ligue 2 side En Avant de Guingamp in 1989. After leaving Guingamp at the end of the 1989–90 season, he signed with Portuguese club Braga, with whom he played 22 games in the Primeira Liga.

CSKA Sofia

• A Group (3): 1982–83, 1986–87, 1988–89
• Bulgarian Cup (5): 1982–83, 1984–85, 1986–87, 1987–88, 1988–89
• Cup of the Soviet Army (3): 1984–85, 1985–86, 1988–89

• Player Profile at ForaDeJogo.net