Poecilocampa populi, the December moth, is a moth of the family Lasiocampidae.
The wingspan is . The moth flies from October to December depending on the location.
The larvae feed on various deciduous trees, such as oak, poplar and lime (Tilia).
It is considered a pest insect, as the larvae will eat apple and plum trees.
It is found in Europe, Northern Asia and Japan.