Shimonia timberlakei is a moth in the Cossidae family. It is found in the Democratic Republic of Congo, where it has been recorded from Eala. The wingspan is 38 mm for males and 41 mm for females. The forewings are glossy light ochre with a sepia cell-spot and a small patch of olive ochre distally. There are several faded lines of olive and an olive subterminal line with a patch of olive ochre in its distal half. The hindwings are uniform glossy light ochre.