Rethymno is a city of approximately 40,000 people in Greece, the capital of Rethymno regional unit on the island of Crete, a former Latin Catholic bishopric as Retimo(–Ario) and former Latin titular see.

It was originally built during the Minoan civilization (ancient Rhithymna and Arsinoe), but was never a competitive Minoan centre. It was, however, strong enough to mint its own coins and maintain urban growth. One of these coins is today depicted as the crest of the town: two dolphins in a circle.