Ahadabui (Syriac: ܐܚܐ ܕܐܒܘܝ‎) was a legendary primate of the Church of the East, who is conventionally believed to have sat from 204 to 220. Although Ahadabui is included in traditional lists of primates of the Church of the East, his existence has been doubted by J. M. Fiey, one of the most eminent twentieth-century scholars of the Church of the East. In Fiey's view, Ahadabui was one of several fictitious bishops of Seleucia-Ctesiphon whose lives were concocted in the sixth century to bridge the gap between the late third century bishop Papa, the first historically attested bishop of Seleucia-Ctesiphon, and the apostle Mari, the legendary founder of Christianity in Persia.