Aquae in Dacia (or Aquæ in Dacia) is a former ancient city and bishopric, now a Latin Catholic titular see. Its location is modern Vidonac, in Serbia.
As a city in the Roman province of Dacia Ripensis, it was important enough to become a suffragan bishopric of the Metropolitan of provincial capital Ratiaria (Raziaria), yet would later fade with the town.
The diocese was nominally restored in 1925 as a titular bishopric.
It has had the following incumbents, so far of the fitting lowest (episcopal) rank:[1]