Cyrilavis is an extinct genus of halcyornithid bird from the Early Eocene Fossil Butte Member of the Green River Formation, United States.

[1] A complete skeleton of a bird from the Green River Formation was described as "Primobucco" olsoni in 1976 from the speciment GSATC 217 as a relative to the Bucconidae based on its zygodactyl foot configuration.

The generic name Cyrilavis is in honour of Cyril Walker, a notable paleontologist of early Cenozoic birds.

[4] In 2011, Ksepka et al. described a new species, Cyrilavis colburnorum, with the holotype FMNH PA 754, a nearly complete skeleton.

Recent analyses have found that the Halcyornithidae, to which Cyrilavis belongs, diverged before the split between parrots and passerines, meaning it is equally closely related to both orders.