Barra Rio Grande Lighthouse, lighthouse in São José do Norte, Rio Grande do Sul, Brazil

The Barra Rio Grande Lighthouse is a 31-metre cylindrical tower of prefabricated cast iron, ordered in London in 1847 and lit on 18 January 1852. It stands on a sandy strip between the Lagoa dos Patos and the South Atlantic, in the municipality of São José do Norte, and is painted in black and white horizontal bands.

A lantern on the tower of the Commander of the Port was lit on 1 December 1820 but failed in the first storm. Pedro I was petitioned in 1827 to rebuild it, and it was relit on 2 August 1842. A prefabricated cast iron tower, 31 m high and ordered in London in 1847, was lit on 18 January 1852; its catoptric system was replaced in 1886 by a second-order Fresnel lens made by Barbier and Fenestre.

The lighthouse's black and white horizontal bands, painted over earlier red coats, make it a recognisable marker for crews heading toward the Rio Grande harbour. The Brazilian Navy manages it under code BR-4008, and its white occulting light, flashing every 21 seconds, is watched by sailors up to 30 nautical miles away.

The lighthouse is easy to reach by foot or car and has simple paths for walking around the area and enjoying views of the water. The location is open and windy, so visitors should wear appropriate clothing for potentially changing weather conditions.

The 1852 tower was prefabricated in London from cast iron and shipped to Brazil in sections. Its lantern kept a catoptric system until 1886, when a second-order Fresnel lens by Barbier and Fenestre was fitted. The Brazilian Navy lists the light as BR-4008.