Woolly bear

Woolly bear may refer to:
 * The hairy caterpillar of any of the moth subfamily Arctiinae
 * The hairy caterpillar of the banded woolly bear (Pyrrharctia isabella)
 * The hairy caterpillar of the Arctic woolly bear moth (Gynaephora groenlandica)
 * The hairy caterpillar of the spotted tussock moth (Lophocampa maculata)
 * The larva of the varied carpet beetle
 * An episode of Thomas the Tank Engine and Friends
 * A type of thermal undersuit worn under a dry suit