The whistling long-tailed cuckoo (Cercococcyx lemaireae) is a species of cuckoo in the family Cuculidae.

[1][2] It was formerly thought to be a disjunct western population of the dusky long-tailed cuckoo (C. mechowi), which it is morphologically indistinguishable from, but it was later split from C. mechowi on account of its different vocalizations.

The whistling long-tailed cuckoo has two distinct songs: one described by Nigel James Collar and Peter Boesman as a song of "three rising notes" (phoneticized as "hu hee wheeu") and a Halcyon kingfisher-esque song described by Collar and Boesman as "plaintive whinnying" (phoneticized as "tiutiutiutiutittiui-tiu-tiu-tiu").

On the other hand, the dusky long-tailed cuckoo has two different songs: a song described by Collar and Boesman as "three similar, less melodious notes" (phoneticized as "wheet-wheet-wheet") and a fast, descending song (phoneticized as "wheewheewheewheewhee").

These song differences led to the description of C. lemaireae as a distinct species.