For the similarly named American bird see Brown Creeper.

The Brown Treecreeper (Climacteris picumnus) is the largest Australian treecreeper. The bird is endemic to to eastern Australia, found in eucalypt forests and woodlands of the Great Dividing Range. The Brown Treecreeper is pale brown to grey-brown, with black streaking on the underparts and black bars on the undertail. The sexes are largely similar. It is an active, noisy bird.

Two subspecies, C. picumnus picumnus and C. picumnus victoriae, have been identified. The Brown Treecreeper is considered a "least concern" species by the IUCN, while the subspecies victoriae, found in New South Wales, is considered threatened by Australian authorities.