Ialysos (Greek: Ιαλυσός, before 1976: Τριάντα Trianta)[2] is a town and a former municipality on the island of Rhodes, in the Dodecanese, Greece.

While official sources use Trianta as a name for the town, and Ialysos for the whole municipal unit, unofficial usage tend to favour Ialysos to describe both the modern town and the municipal unit.

The municipal unit has a land area of 16.700 square kilometres (6.448 sq mi), the smallest of any on Rhodes.

State facilities by category: Town football team GAS Ialysos currently competes at national level third tier (Gamma Ethniki) while in the 90s team competed even at Beta Ethniki (now Football League) losing promotion to Greece's top league during 1994-95 season.

GAS Ialysos currently competes on local league but in the past reached national league C. Town municipal "Ekonomideio" stadium hosts football and Ialysos indoor hall basketball.