Mostardas Lighthouse, Maritime beacon in Mostardas, Brazil

The Mostardas Lighthouse is a cylindrical concrete tower with a lantern and gallery, painted in horizontal black and white bands, on the coast of Rio Grande do Sul facing the South Atlantic. The tower stands 40 metres tall, with a focal height of 39 metres. It shows two red and white flashes every 40 seconds, visible up to 34 nautical miles.

The first Mostardas Lighthouse was inaugurated in 1894 with a metal structure, which rust and neglect damaged over the following decades. In 1940 it was rebuilt in masonry, reusing the lens and lantern of the old tower. The current tower stands 40 m tall, with a focal height of 39 m. It is managed by the Brazilian Navy's Centro de Sinalização Náutica e Reparos Almirante Moraes Rego.

The lighthouse is owned by the Brazilian Navy and managed by the Centro de Sinalização Náutica e Reparos Almirante Moraes Rego, within the Directorate of Hydrography and Navigation. Its name comes from the municipality of Mostardas, though the tower stands in the Tavares area, 20 km north of Tavares town, facing the South Atlantic.

The structure is best viewed from the water, so reaching it requires a boat trip or viewing it from the nearby harbor. Early morning or late afternoon light offers the best conditions for photography and observation.

The structure stands near Lagoa do Peixe National Park, where migratory water birds rest and nest throughout the year. This location makes it a worthwhile spot for birdwatchers and nature observers.