The western yellow-billed barbet (Trachyphonus goffinii) is a species of bird in the African barbet family Lybiidae that is found from Sierra Leone to southwest Nigeria in West Africa.

The species was formerly considered to be conspecific with the eastern yellow-billed barbet.

The western yellow-billed barbet was formally described in 1863 by the Dutch army officer and ornithologist Andreas Leopold August Goffin (1837–1863) under the binomial name Capito goffinii.

The specimens had been collected by Cornelis Nagtglas in the Dutch Gold Coast (now part of Ghana).

The western yellow-billed barbet is now considered to be a separate species based on the differences in morphology and the deep mitochondrial DNA divergence.