Aristeidis ("Aris") Grigoriadis (Greek, Modern (1453-);: Άρης Γρηγοριάδης; born 6 December 1985) is a Greek swimmer from Thessaloniki. He was named the 2005 Greek Male Athlete of the Year.
Grigoriadis was the first Greek swimmer to be crowned world champion in the 50 m backstroke event of the 2005 World Championships in Montreal. At the European Championships of Eindhoven in 2008, he won two medals: the gold in 50 m backstroke and the silver in 100 m backstroke.
He participated at the 2012 Olympic Games in the 100 m backstroke event, in which he reached the semifinals, taking the 14th place.