The brown gerygone (Gerygone mouki), previously known as the brown warbler, is a small passerine bird native to eastern coastal Australia.

Although total population trends have not been quantified, it is considered of "least concern" by the IUCN.

It may be sighted in coastal rainforest, singly or in small groups of two to four.

It is not closely related to either true Old World Warblers or the New World Warblers, but belongs rather to the Corvida parvorder comprising many tropical and Australian passerines, as well as crows.

It differs from the former by having a distinctive white eyebrow and a grey-tinged face.