Mario Aerts (born 31 December 1974 in Herentals, Belgium) is a former professional road bicycle racer, who competed between 1996 and 2011.

During this time, he raced in the Tours de France, the Giro d'Italia, and the Vuelta a España.

Aerts won the Grand Prix d'Isbergues in 1996, Circuit Franco Belge in 2001, the Giro della Provincia di Lucca in 2001, and most notably La Flèche Wallonne in 2002; he did not win a professional race after that.

In June 2011, he announced his retirement as a professional cyclist at the end of the year, citing heart problems as the major cause.

This biographical article related to a Belgian cyclist born in the 1970s is a stub.