Sinusonasus (meaning curved nose) is a Troodontid from early Cretaceous China. It was about 3.9 ft (1.2 m) long and weighed about as much as a chicken.

Sinosonasus magnodens by bensen daniel

The nose bones were found to be curved, hence the name is a genus of dinosaurs from the Early Cretaceous Period, recovered from the Yixian Formation. It lived in what is now the Liaoning Province of China. Sinusonasus was a theropod, specifically a troodontid dinosaur. The type species, Sinusonasus magnodens, was named and described by Xu Xing and Wang Xiaolin in 2004. The generic name, derived from Latin sinus, "wave", and nasus, "nose", refers to the sinusoid form, in lateral view, of the nasals. The specific name means "big-toothed" from Latin magnus, "large" and dens, "tooth". In a later publication the species is referred to as "Sinucerasaurus"[2] but this is a junior objective synonym.