Phaedrolosaurus (meaning "elated lizard") is a genus of dubious coelurosaurian theropod dinosaur, based on a single isolated and non-diagnostic tooth possibly from the Valanginian-Albian-aged Lianmuqin Formation of Wuerho, in the autonomous region of Xinjiang, China.

The generic name is derived from the Greek φαιδρός, phaidros, "elated", referring to the agility of the animal.

Dong stated the thirty-one millimetre long tooth was like those of Deinonychus, albeit thicker, shorter, and more solid.

[2] As part of the type material of this genus Dong described several skeletal elements from other sites, among them a partial, articulated right leg.

[3] Because Dong had not designated a holotype among the several specimens in 1973 assigned to Phaedrolosaurus, in 1977 Hans-Dieter Sues had made the tooth the lectotype.