| Named By: | Fraser, Padian, Walkden & Davis in 2002 |
| Time Period: | Late Triassic, 208 Ma |
| Location: | England, Avon |
| Size: | Uncertain due to lack of remains |
| Diet: | Uncertain |
| Fossil(s): | Partial skull and post cranial remains |
| Classification: | | Chordata | Reptilia | Dinosauromorpha | |
Agnosphitys ("unknown begetter"; sometimes mistakenly called Agnostiphys or Agnosphytis is a genus of silesaurid dinosauriform that lived during the Late Triassic. It contains only one species, the type species A. cromhallensis. Its remains include an ilium, maxilla, astragalus and humerus, which date variously from the Norian and Rhaetian stages of the Late Triassic.
The type species, Agnosphitys cromhallensis, was described by Nicholas Fraser, Kevin Padian, Gordon Walkden and A. L. M Davis in early 2002. The fossils, consisting of a partial skeleton including referred material, were found in Avon, England.