Thanasis Papakonstantinou (b. April 26, 1959, Tyrnavos) is a Greek singer-songwriter. He is also the owner of Αχός label & Αχός Studio.
In his musical creations he mixes his rebetiko & traditional influences with rock and experimental elements as well.
He has collaborated with notable Greek artists such as Γιάννης Αγγελάκας, Μελίνα Κανά, Σωκράτης Μάλαμας, Νίκος Παπάζογλου and recently with Διονύσης Σαββόπουλος.
Father of the twins Κωνσταντής Παπακωνσταντίνου & Αριστοτέλης Παπακωνσταντίνου.