Rhaphigaster nebulosa, common name mottled shieldbug, is a species of stink bug in the family Pentatomidae.

[1][2] This species is distributed throughout the Palearctic region, more commonly in the southern than in the northern parts of Central Europe (Austria, Canada, Croatia, France, Germany, Greece, Hungary, Italy, Luxembourg, Serbia, Slovenia, Spain, Switzerland, Turkey, United Kingdom), and is not known to occur in the United States.

These large shieldbugs are hairless and coloured dirty yellowish-grey to brown with irregularly-distributed fovea on the top side of its body.

[6] Mottled shieldbugs are polyphagous, feeding on sap from a range of broadleaved woody plants such as birch and hazel (Betulaceae); Arbutus (Ericaceae); beech and oak (Fagaceae); plane tree (Platanaceae); hawthorn, apple, plum and whitebeam (Rosaceae); Johnson grass (Poaceae); poplar and willow (Salicaceae); and Ulmus minor (Ulmaceae).

[3] To protect against predators, young bugs have stink glands on their back; in the case of adults, these are to be found on the underside of the thorax.

[citation needed] Eggs of R. nebulosa, like those of some other stink bugs, are parasitised by the samurai wasp Trissolcus japonicus (Scelionidae).