The great xenops (Megaxenops parnaguae) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is endemic to eastern Brazil.

The great xenops is 15 to 16 cm (5.9 to 6.3 in) long. It has a heavy, wedge-shaped, slightly upturned bill. The sexes' plumages are alike. Adults have a mostly light orange-rufous face with some blackish around the eye. Their forehead is pale but bright cinnamon-buff. Their crown and upperparts are unmarked bright rufous and their tail bright cinnamon-rufous. Their wing coverts are bright rufous, their primary coverts dull brownish, and their flight feathers bright orange-rufous with dark fuscous tips. Their throat and malar area are white and the rest of their underparts mostly light orange-rufous. Their flanks are slightly darker and their undertail coverts more rufous. Their iris is dark brown, their bill dusky brownish gray with a white base to the mandible, and their legs and feet dark gray to black.