Sphingnotus mirabilis is a species of beetle belonging to the family Cerambycidae.

Sphingnotus mirabilis can reach a length of 25–40 millimetres (0.98–1.57 in).

Head, prothorax and elitra have a brilliant metallic blue colour.

Elyra bears two trasversal whitish or azure bands.

This species can be found in New Guinea.