Baia was an ancient city and bishopric in the Roman province of Africa Proconsulare.
It is now a Roman Catholic titular see.
Baia, identified with modern Henchir-Settara or Henchir-El-Hammam in present-day Algeria, was among the many towns in the Roman province of Numidia that were significant enough to become a suffragan diocese under papal authority.
Five of its Catholic bishops are historically recorded: The diocese was nominally restored in 1933 as the Latin Titular bishopric of Baia (Latin: Baianen(sis)).
It has had the following incumbents, all of whom held the Episcopal (lowest) rank: