Aristeidis ("Aris") Grigoriadis (Greek: 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.

He participated at the 2012 Olympic Games in the 100 m backstroke event, in which he reached the semifinals, taking the 14th place.

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