Loutropoli Thermis (Greek: Λουτρόπολη Θερμής) is a village and a former municipality on the island of Lesbos, North Aegean, Greece.

Archaeological finds indicate that during the antiquity, the Greek goddess Artemis was worshipped as protector of the curative springs.

After archaeological excavations in the past years next to the beach, the layers and traces of five cities built one over the other were revealed, the oldest of which dates back to the middle of the 3rd millennium.

The magnificence and the radiance of the religious and therapeutic centre of Thermi is also testified by numerous archaeological finds, including the foundations of buildings and inscriptions.

At the beginning of the 20th century, the region of Thermi was popular for its luxurious hotel, Sarlitza Palace, which was built on the plans of French architects.