The cactus canastero (Pseudasthenes cactorum) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae.

Beginning in 2010 it and three other members of Asthenes were moved to the newly coined genus Pseudasthenes.

[2][4] The Clements taxonomy assigns it two subspecies, the nominate P. c. cactorum (Koepcke, 1959) and P. c. lachayensis (Keopcke, 1965).

[5] However, the two putative taxa "appear to be products of clinal variation combined with differences in degree of plumage wear, and described characters do not permit diagnosis of individual specimens".

It inhabits arid montane scrublands with scattered bushes and columnar cacti.

It is usually seen singly or in pairs and is believed to glean arthropods from the ground, rocks, cacti, and maybe low vegetation.