| Named By: | Z.inX. Luo, Q. Ji, J. R. Wible & C.inX. Yuan in 2003 |
| Time Period: | Early Cretaceous, 125 Ma |
| Location: | China, Liaoning Province - Yixian Formation |
| Size: | About 15 centimetres long |
| Diet: | Insectivore |
| Fossil(s): | Almost complete individual including impressions of soft tissue and fur |
| Classification: | | Chordata | Mammalia | Metatheria | |
Sinodelphys is an extinct mammal from the Early Cretaceous. To date, it is the oldest metatherian fossil known, estimated to be 125 million years old. It was discovered and described in 2003 in rocks of the Yixian Formation in Liaoning Province, China, by a team of scientists including Zhe-Xi Luo and John Wible.