Thera variata, the spruce carpet, is a moth of the family Geometridae.

The forewings are light ochreous-brown, sprinkled with dark fuscous with an ochreous-brown basal patch the edge waved, right-angled above middle; The median band is ochreous-brown or dark fuscous, black-marked on veins, edges dark fuscous, sometimes whitish-margined its anterior angulated in middle and its posterior waved, right-angled above middle.

There is a black discal mark, a subterminal line obscurely whitish and a cloudy darker apical dash.

The hindwings are pale fuscous, ochreous tinged with a darker discal dot and sometimes a curved postmedian line.

The larva is blue-green; dorsal line darker, pale edged; subdorsal yellowish-white, posteriorly yellow; subspiracular yellowish-white; segment 13 with two points.