The white-tailed trogon (Trogon chionurus), also known as the Western white-tailed trogon, is a near passerine bird in the trogon family. It is found in tropical humid forests of the Chocó, ranging from Panama, through western Colombia, to western Ecuador. It was formerly considered a subspecies of T. viridis, which is widespread in South America east of the Andes, but under the English name white-tailed trogon (a name now reserved for T. chionurus, leaving T. viridis as the green-backed trogon).