Mata Paludosa Biological Reserve (Portuguese: Reserva Biológica Estadual Mata Paludosa) is a state biological reserve in Rio Grande do Sul, Brazil.

The reserve, with 113 hectares (280 acres) in the municipality of Terra de Areia, was created on 23 October 1998.

[1] Administration was assigned to the State Secretariat of Agriculture and Supply.

On 13 September 2012 the reserve was expanded to include new areas of great environmental interest, to include springs on the slope area, and to adjust to the new route of the Rota do Sol highway.

[3] Mata Paludosa is the only conservation unit in the state that protects areas of transition between slopes and flat environments, with remnants of forest formed on very wet land, interspersed with wetland vegetation.