The curve-billed reedhaunter (Limnornis curvirostris) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae.

It is a small furnariid whose plumage closely resembles that of some Old World reed warblers of genus Acrocephalus.

[6] The curve-billed reedhaunter is found in the Brazilian state of Rio Grande do Sul, in southern Uruguay, and in eastern Argentina's Entre Ríos and Buenos Aires provinces.

[6] The curve-billed reedhaunter feeds on a variety of adult and larval arthropods that it gleans from marsh vegetation.

[6] The curve-billed reedhaunter is assumed to breed during the austral spring and summer, and is thought to be monogamous.

It constructs a ball-shaped nest of grass, leaves, and other fibers and lines it with softer plant material.

The curve-billed reedhaunter's song is a "fast series of harsh notes that ascend and then descend in pitch, fading towards [the] end".