Lolium giganteum, giant fescue, is a woodland grass that grows on neutral to base-rich soils, often near streams or other damp places.

Most publications have used the names Festuca gigantea or, more recently, Schedonorus giganteus for this species, but DNA studies appear to have settled a long debate that it should be included within the genus Lolium instead.

Giant fescue is a loosely tufted perennial with erect to spreading hollow flowering stems up to about 1.4 m (4 ft) tall (exceptionally up to 165 cm), with purple nodes.

Flowering typically occurs in late summer, from mid-July until early September, with a loose, nodding open panicle about 40 cm (18 inches) long.

It is a common plant found especially on heavy, neutral and calcareous soils, in woodland, hedge banks and shady places.