The Brown Gerygone (Gerygone mouki), previously known as the Brown Warbler, is a small passerine bird native to eastern coastal Australia. The upper parts of the Brown Gerygone are a deep olive-grey or olive-brown, while its face and underparts are a much paler grey, cream, or washed-out brown. The tail feathers are dark and may be white-tipped. It is approximately 10 cm in length.