Polyeunoa is a genus of marine annelids in the family Polynoidae (scale worms).

Species of Polyeunoa are long-bodied with 70 or more segments and at least 15 pairs of elytra.

The elytra leave part of the mid-dorsal body and most posterior segments uncovered.

Cephalic peaks are absent or very small on the prostomium and the lateral antennae are inserted beneath the median antenna.

Both unidentate and bidentate forms of chaetae are present.