Neoclytus acuminatus, the red-headed ash borer, is a common North American species in the longhorn beetle family (Cerambycidae).

Red-headed ash borers typically reach 12–16 mm (0.47–0.63 in) adult length, have long antennae which are thickened towards the tips, and have the rear and middle pairs of legs elongated.

The reddish-brown coloration with four bands of contrasting yellow stripes and the general body shape mimics wasps, which is a common survival tactic among cerambycids.

Adults emerge from infested trees in early spring, typically ash, hickory and oak, but also use other hardwoods and sometimes shrubs and woody vines.

The feeding of the larvae may cut off sap flow, and in some cases weaken the trunk of young trees making them more susceptible to wind damage.