The cinereous-breasted spinetail (Synallaxis hypospodia) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae.

Their wing coverts are chestnut-rufous and their flight feathers dark brown with rufescent edges.

Juveniles have a gray-brown crown, mostly ochraceous clay-brown underparts, and a less distinct throat patch than the nominate.

[6][3] The cinereous-breasted spinetail inhabits a variety of open landscapes including seasonally wet grassland, scrublands, campina, and savannah.

It is thought to feed on arthropods that it gleans from foliage and small branches, staying about 1 to 2 m (3 to 7 ft) above the ground.

Remsen describes the cinereous-breasted spinetail's principal vocalization as "a hurried and loud chatter on same pitch, 'chéw, chew-chee-chee-chee-ee-ee-ee-ee-ee-eu', accelerating at end".