Tinagma giganteum is a moth in the family Douglasiidae.

It is found in North America, where it has been recorded from Alberta[2] and Montana.

The scales of the ground colour of the forewings are pale grey at their bases, shading into white and followed by a black tip.

There is a broad blackish transverse fascia just before the middle of the wing, margined with white on the outer edge.

This article relating to the superfamily Gracillarioidea is a stub.