Thurii – Greek: , called also by some Latin writers and by Ptolemy, Thurium (, Ptol.), for a time also Copiae and sometimes written as Turios – was a city of Magna Graecia, situated on the Tarentine gulf, within a short distance of the site of Sybaris, of which it may be considered as having taken the place. Its location is in the commune of Terranova da Sibari, in the Province of Cosenza, Calabria region, Italy.

An Athenian colony where Herodotus is supposed to have spent some of his time