Giant's Tank Sanctuary ( Kaá¹Âá¹Âukkarai Kuḷam Caraá¹ÂÃÂlayam) is a wildlife sanctuary in northern Sri Lanka, approximately south east of Mannar.
Giant's Tank and its surrounding area was designated as a sanctuary on 24 September 1954 under the Fauna and Flora Protection Ordinance (No. 2) of 1937. It had an area of in 1990. It currently has an area of .
Giant's Tank Sanctuary has been subject to illegal deforestation to make way for banana plantation for the Dole Food Company.
Giant's Tank is surrounded by rice paddies and dry scrub forest. Numerous varieties of water and wader birds are found in the sanctuary including the Eurasian wigeon, garganey, knob-billed duck and pygmy goose. Fish found in the tank include channa striata, heteropneustes fossilis, labeo dussumieri, Mozambique tilapia, olive barb, ompok bimaculatus and long-snouted barb. Asian elephants are also found in the sanctuary.