Praia do Siriú, Coastal beach in Santa Catarina, Brazil.

Praia do Siriú is a coastal beach in Santa Catarina with golden sand bordered by natural dunes and green vegetation. The shoreline stretches with minimal development, preserving an open and undeveloped character throughout.

Praia do Siriú lies within the Área de Proteção Ambiental da Baleia Franca and the Área de Proteção Ambiental do Entorno Costeiro, conservation units created to protect the southern right whale and coastal ecosystems. The beach is the longest in Garopaba, with about 4 km of sand, and its dunes reach 40 m in height. The Lagoa do Siriú, at the northern end, is a nursery for shrimp and fish.

The Lagoa do Siriú, at the beach's northern end, is where shrimp and several fish species breed, and the lagoon's outflow shapes the local catch. The beach lies within the Área de Proteção Ambiental da Baleia Franca, a conservation unit tied to the southern right whale.

Access to the southern end is via a paved road for about 500 m followed by a 100 m downhill trail; the northern end is reached by an 8 km dirt road, where basic facilities serve visitors. Bathers should watch the flags on the shore, since a red flag means staying out of the nearby water. The sand has holes and an uneven floor, so enter with care.

The dunes reach up to 40 metres high, and rainwater collects between them to form temporary natural pools. The beach lies within the Área de Proteção Ambiental da Baleia Franca, a coastal protected area.