Acanthiza is a genus of passeriform birds, most endemic to Australia, but with two species (A. murina and A. cinerea) restricted to New Guinea.

They are not closely related to species in the hummingbird genera Chalcostigma and Ramphomicron, which are also called thornbills.

[2] Like tits, Thornbills live in small groups foraging amidst trees and shrubs, and feed in a similar manner.

[3] The habitat preferences of the group vary from dense forest to open saltbush and bluebush plains.

Their diet is formed essentially of little insects and plant lice that these birds glean from foliage.