The Javan blue flycatcher (Cyornis banyumas) is a species of bird in the family Muscicapidae.

It is endemic to the Indonesian islands of Java and Panaitan.

[2] The Dayak blue flycatcher (Cyornis montanus) of Borneo, which was formerly considered conspecific, was split as a distinct species by the IOC in 2021.

[3] It is typically solitary or spends time in pairs.

This article about an Old World flycatcher is a stub.