The narrow-billed woodcreeper (Lepidocolaptes angustirostris) is a species of bird in the subfamily Dendrocolaptinae of the ovenbird family Furnariidae.

Adults of the nominate subspecies L. a. angustirostris have pale lores, a buffy white supercilium that widens to the rear and becomes a line of broken spots, and a black stripe behind the eye.

Juveniles have darker upperparts than adults, with a more blackish head, more ochraceous supercilium and underparts, and more distinct streaks on the latter.

[2][3] The narrow-billed woodcreeper inhabits a variety of semi-open and open landscapes, mostly in the tropical zone but reaching the subtropics in the eastern Andean foothills.

[3] The narrow-billed woodcreeper's diet is mostly invertebrates like insects and spiders but it has been observed taking a small frog.

It typically forages singly or in pairs though sometimes in small groups, and regularly joins mixed-species feeding flocks.

[3][5] The narrow-billed woodcreeper's breeding seasons vary somewhat across its range but generally fall between September and February.

It nests in cavities, either natural or excavated by woodpeckers in trees but also in human constructs such as bridge supports.

The narrow-billed woodcreeper's song is "a loud series 3–5 seconds long of 4–8 sharp descending notes that may be either clear whistles 'peer, peer, peer, peeer, peeeer, pweeeer', rolling and somewhat slurred repetitions of 'drewEEew', or clear notes that gradually accelerate, fade and descend, 'peeé, pee-pee-pee-pee-peepeepeepeepupupu'."