Menegazzia brattii is a rare species of foliose lichen in the family Parmeliaceae.

The type specimen was collected from the Bras de la Fonderie in the Kerguelen Islands.

Here it was found at the summit of coastal cliffs west of Col Demi-Lune.

The lichen was growing on the bark of an unidentified tree or shrub.

The specific epithet brattii honours Tasmanian lichenologist Geoffrey Charles Bratt, who collected the type specimen in 1971 when he was on a botanical expedition in Kerguelen with Henry Imshaug.