Sant Llorenç des Cardassar (Catalan pronunciation: [səɲ ʎoˈɾɛnz ðəs kəɾðəˈsa]) is a small municipality on Mallorca, one of the Balearic Islands, Spain.

[2] Sant Llorenç des Cardassar was the tragic scene of flash floods on the night of 9 October 2018, in which 13 people died.

The Punta de n'Amer [ca], a headland at the eastern end of the municipality, separates the beaches of Cala Millor and Sa Coma.

The Ma-15 [es], the main road from Palma, acts as a bypass around the southern and eastern sides of the town centre of Sant Llorenç, continuing north through Artà.

The Ma-4023 road is on an approximate north-south axis, parallel to the coast but about 1 mi (1.6 km) inland from the beach areas, connecting Son Servera with Porto Cristo.