| Named By: | D. A. Russell & Z.inM. Dong in 1994 |
| Time Period: | Early Cretaceous, 113 Ma |
| Location: | China - Zhonggou Formation |
| Size: | About 1 meter long, but holotype is of a subadult, a fully grown adult would likely be slightly larger |
| Diet: | Carnivore |
| Fossil(s): | At least one almost complete specimen of a subadult |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Theropoda | Troodontidae | |
Sinornithoides (meaning "Chinese bird form") is a genus of troodontid theropod dinosaurs containing the single species Sinornithoides youngi. S. youngi lived during the Early Cretaceous (Aptian/Albian stage, around 113 million years ago). It measured approximately one meter long (3.3 ft). It lived in Inner Mongolia, China, and probably ate invertebrates and other small prey.