Antoni Barnaba Jablonowski (1732–1799) was a Polish noble (szlachcic) and political activist.
Antoni became voivode of Poznan Voivodship in 1760, castellan of Kraków since 1782, starost of Medzyrzecze, Busko-Zdrój, Swiecie and Czehryn.
During the Confederation of Bar he was envoy of the leaders of the confederation to the royal court in Austria.
He participated in the Great Sejm in 1788–1792 and was member of the Patriotic Party.
He was a supporter of the May 3rd Constitution.
In 1794 he participated in the Kosciuszko Uprising.
Knight of the Order of the White Eagle, awarded on August 3, 1761 in Warsaw.