The plain-mantled tit-spinetail (Leptasthenura aegithaloides) is a small passerine bird of South America belonging to the ovenbird family, Furnariidae. It is a common bird across much of Chile, southern and eastern Argentina, southern Peru and western Bolivia. It occurs from 0 to 4,300 metres above sea level in a variety of habitats including arid country, open woodland, forest edge, scrub, grassland, parks and gardens. It forages among leaves and branches, searching for insects. The song and calls are loud, buzzy and chattering and vary between the different subspecies.