Radiodactylus (meaning "radio finger") is an extinct genus of non-azhdarchid azhdarchoid pterosaur known from the Early Cretaceous period of what is now Texas, southern United States.

The holotype was collected from the Glen Rose Formation at the north side of Squaw Creek in Somervell County, dating to the upper Aptian or lower Albian stage of the late Early Cretaceous period, about 119-112 million years ago.

[1] Andres and Myers (2013) diagnosed Radiodactylus on the basis of the unique combination of tall rectangular deltopectoral crest positioned proximally and pneumatic foramen present on distal portion of the humerus.

The absence of a deep horseshoe-shaped cross section of the humeral head and a distinct supracondylar process on the humerus shaft differentiated Radiodactylus from members of the Azhdarchidae.

This sister taxon relationship supported by the largest and most inclusive pterosaur phylogenetic analysis to date warranted the erection of a new genus and species for this material.