Noctua fimbriata, the broad-bordered yellow underwing, is a moth of the family Noctuidae.

The border of its southern range is unclear because of the similar looking species Noctua tirrenica.

Forewing ranging from pale ochreous and rufous in the female to red-brown and olive-green in the male; ochreous males are rare; markings slight in the female, strong in the male;inner line dark; outer and submarginal pale; upper stigmata large, pale-edged, often touching; a dark costal blotch before submarginal line: hindwing and fringe orange, with a very broad black border; the pale rufous forms are known as ab.

brunnea Tutt; the dark olive-green males are solani F., while the paler more ochreous green specimens (?

The larvae feed on Rumex, nettle and low growing woody plants on occasion.