Protorthodes alfkenii is a moth in the family Noctuidae first described by Augustus Radcliffe Grote in 1895.

It is an extremely variable species in terms of size, ground color and pattern, yet is easily identified by a combination of features.

The hindwings in males are white, often with a slight pearly sheen and with fuscous shading confined to the veins and outer part of the wing.

Some females have more extensive fuscous shading on the hindwings, but usually a pearly sheen is still evident.

In the Pacific Northwest they fly from mid-July to late September.