The ash-browed spinetail (Cranioleuca curtata) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae.

[2] The ash-browed spinetail has three subspecies, the nominate C. c. curtata (Sclater, PL, 1870), C. c. cisandina (Taczanowski, 1882), and C. c. debilis (Berlepsch & Stolzmann, 1906).

Adults of the nominate subspecies have a supercilium that varies from bold whitish to obscure dingy gray.

Their wings are reddish chestnut; their flight feathers are slightly paler with dark fuscous tips.

Their chin is very pale brownish gray, their throat browner with light streaking, and their underparts dull browish with slightily richer brown flanks.

It acrobatically probes for and gleans prey from bark, moss, epiphytes, dead leaves, and debris while hitching along small branches, sometimes hanging upside down.

"The primary threat to this species is accelerating deforestation as forests within the range are converted for ranching and farming.