Aqueduto de Santa Clara, 18th-century aqueduct in Vila do Conde, Portugal.

The Santa Clara Aqueduct is a stone structure with round arches that carried water from a spring in Terroso to the Santa Clara Convent in Vila do Conde, spanning about four kilometers. It originally had 999 arches, some now destroyed, and is considered the aqueduct with the greatest number of arches in the world. Its final section is still visible in the town, passing near buildings.

Construction began under Abbess Donna Maria de Menezes, who bought the land around the spring. Work halted in 1636 when Abbess D. Catarina Lima noticed an error in the slope calculation. It resumed only in 1705 under Abbess D. Bárbara Micaela de Ataíde and was completed in 1714.

The aqueduct is named after the Convent of Santa Clara in Vila do Conde, the Carmelite convent whose water supply it carried over four kilometres from a spring in Terroso. Its construction was funded and driven by the convent's abbesses, notably D. Bárbara Micaela de Ataíde, who resumed the works in 1705. The Spanish edition of National Geographic ranked it third among the world's most beautiful aqueducts in 2015, behind the Pont du Gard and the Kamares aqueduct in Larnaca.

The remaining arches are accessible by foot in the town center and can be seen directly from nearby streets without special access requirements. Taking time to walk along the route and view the structure from different angles helps appreciate the craftsmanship of the stonework.

The Spanish edition of National Geographic, on 2 April 2015, ranked the Santa Clara Aqueduct third among the world's most beautiful aqueducts, behind the Pont du Gard in France and the Kamares Aqueduct in Larnaca, Cyprus. With 999 arches originally, it is considered the aqueduct with the greatest number of arches in the world.