Drymonia querna, the oak marbled brown, is a moth of the family Notodontidae.

It is found in the Middle East and mainland Europe except the north.

The wingspan is 38–43 mm.The body and forewing are dark grey-brown, the latter with a slight reddish violet tone and sharply marked white lunule at apex of cell; before and again after the centre a black transveree line, the proximal one straight and only in front of hind margin curved outward, the distal one dentate with white edge, from which extend short black vein-streaks towards the margin; a light submarginal line undulate.

Larva green, with numerous minute whitish spots and approximated whitish subdorsal lines; on a level with the black-margined spiracles a red-edged longitudinal stripe which is interrupted at the segmental incisions; head greenish.

The larvae inhabit warm and dry woodlands and scrub in the lowlands.