Alexander Iolas or Alexandre Iolas (Greek: Αλέξανδρος Ιόλας; born Κωνσταντίνος Κουτσούδης Constantine Koutsoudis; 25 March 1907 – 8 June 1987) was a Greek gallerist and collector. He owned galleries in the United States and Europe and contributed in many private and public art collections.