Agaronia leonardhilli is a species of sea snail, a marine gastropod mollusk in the family Olividae, the olives.

[2] (Original description) The shell is narrow and very elongated, with a high, elevated spire.

The aperture is narrow, and the columella is slender with twisted plications.

The shell is gray with numerous large, dark brown zigzag longitudinal flammules.

The edge of the shoulder along the suture is marked with conspicuous, large, intermittent dark brown patches.