Aqueduct of Saintes, Roman aqueduct in Charente-Maritime department, France

The Aqueduct of Saintes is a Roman gravity-fed water supply running northeast to southwest from springs at Fontcouverte, Le Douhet and Vénérand toward Saintes. Channels are U-shaped or square in section, about 60 cm deep and 30–40 cm wide, cut into tunnels, open channels or bridges according to the terrain. Two piers of the canal bridge and some underground galleries survive; a section of conduit is displayed at the Saintes archaeological museum.

The Romans built the aqueduct around AD 20, under the Julio-Claudian dynasty, to supply Mediolanum Santorum with drinking water. A second phase, dated to roughly 70–120, followed the town's expansion and rising population; a third section was uncovered in 2010 and is still undated. Use ended in the 4th century, after which much of the masonry was reused in other buildings.

The name Fontcouverte, the village at the source, comes from the covered basin cut into the rock that gave the town its name, "covered fountain". Near the sources, washhouses were added in the 18th and 19th centuries, and the water still flows through them today. A section of the U-shaped channel is displayed in the archaeological museum of Saintes.

Some underground sections of the aqueduct are accessible and can be visited, contrary to what older descriptions say; access to the Font Morillon source chamber at Fontcouverte is regulated because of the 2013 excavations. Elsewhere the water runs in the open, unprotected along much of its route outside the galleries. Two piers of the canal bridge and the bases of others remain standing.

The aqueduct's slope was kept to less than 1 mm per metre (0.08–0.1%), letting water flow by gravity alone. Where the second aqueduct met the first, builders reused the existing bridges and simply raised their floors, since the newer channel ran slightly higher. A section of the U-shaped conduit is displayed in the archaeological museum of Saintes.