Konduwattuwana Wewa (Sinhalese: ) or Kondawattuwana Wewa is an ancient reservoir located in Ampara, Sri Lanka. The reservoir lies on the Ampara – Inginiyagala main road, approximately away from the town of Ampara. The site with ancient Buddhist ruins which belonging to the Konduwattuwana reservoir area is a formally recognised an archaeological site in Sri Lanka.
The reservoir is believed to be built during 1st-3rd century BC and had been renovated time to time to facilitate irrigation and drinking water to the nearby area. According to a stone pillar inscription found near the reservoir, the irrigation water of this reservoir was taxed, along with the paddy fields during the reign of King Dappula IV (939 - 940). Further it reveals that unlawful tapping of irrigation water had also been prohibited by the edict.