Favorlang is an extinct Formosan language formerly spoken in the Central-Weastern plain of Taiwan. The few documents in it written by seventeeth century Dutch missionaries indicate some interesting features not commonly found in other Formosan or extra-Formosan languages. Favorlang was, closely related to Babuza, which itself had died out by the end of the nineteenth century, before Japanese scholars had had a chance to investigate it in any detail.