Alexander Mronz (born 7 April 1965) is a former tennis player from Germany, who turned professional in 1987.

Mronz reached his highest individual ranking on the ATP Tour on April 8, 1991, when he became the world No.

Mronz is famous for being the opponent of Jeff Tarango in a third round match at 1995 Wimbledon, having already knocked out Sjeng Schalken and Kenneth Carlsen to get to that stage.

Mronz was leading by a set and a break, when Tarango was defaulted after losing his temper with the umpire, Bruno Rebeuh, following a couple of code violations.

1 and three-time Australian Open champion Mats Wilander (who was currently in the process of coming back to the sport), 6–4, 7–5, 3–6, 4–6, 3–6.