Abas (in Greek Aβας) was an ancient Greek sophist and a rhetorician about whose life nothing is known. The Suda ascribes to him historical commentaries (in Greek ιστoρικα απoμνηατα) and a work on rhetoric (in Greek τεχνη ρητoριχη}. What Photius in his Myrobiblion quotes from him, belongs probably to the former work.

Abbreviation for: aircraft-based augmentation system Fr: ABAS