Coelurosauria from Greek ?????? (koîlos, "hollow") + ???? (ourá, "tail") + ????? (saúra, "lizard") + -ia, meaning "hollow-tailed lizards", is the clade containing all theropod dinosaurs more closely related to birds than to carnosaurs.

Coelurosauria is a subgroup of theropod dinosaurs that includes compsognathids,